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18302031 = 351141167
BaseRepresentation
bin100010111010…
…0010001001111
31021102211200000
41011310101033
514141131111
61452135343
7311364456
oct105642117
937384600
1018302031
11a370650
126167553
133a3a607
142605b9d
151917c56
hex117444f

18302031 has 48 divisors (see below), whose sum is σ = 30820608. Its totient is φ = 10756800.

The previous prime is 18302023. The next prime is 18302033. The reversal of 18302031 is 13020381.

It is not a de Polignac number, because 18302031 - 23 = 18302023 is a prime.

It is a super-2 number, since 2×183020312 = 669928677449922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18301995 and 18302013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18302033) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 109510 + ... + 109676.

It is an arithmetic number, because the mean of its divisors is an integer number (642096).

Almost surely, 218302031 is an apocalyptic number.

18302031 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18302031 is the 2706-th heptagonal number.

18302031 is a deficient number, since it is larger than the sum of its proper divisors (12518577).

18302031 is a wasteful number, since it uses less digits than its factorization.

18302031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 18302031 is about 4278.0873062620. The cubic root of 18302031 is about 263.5318407442.

The spelling of 18302031 in words is "eighteen million, three hundred two thousand, thirty-one".

Divisors: 1 3 9 11 27 33 41 81 99 123 167 243 297 369 451 501 891 1107 1353 1503 1837 2673 3321 4059 4509 5511 6847 9963 12177 13527 16533 20541 36531 40581 49599 61623 75317 109593 148797 184869 225951 446391 554607 677853 1663821 2033559 6100677 18302031