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18219955 = 5131914753
BaseRepresentation
bin100010110000…
…0001110110011
31021021200002011
41011200032303
514131014310
61450303351
7310603255
oct105401663
937250064
1018219955
11a314a16
126127b57
133a0c150
1425c3cd5
1518ed78a
hex11603b3

18219955 has 16 divisors (see below), whose sum is σ = 24786720. Its totient is φ = 12745728.

The previous prime is 18219953. The next prime is 18219959. The reversal of 18219955 is 55991281.

It is a cyclic number.

It is not a de Polignac number, because 18219955 - 21 = 18219953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18219953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6142 + ... + 8611.

It is an arithmetic number, because the mean of its divisors is an integer number (1549170).

Almost surely, 218219955 is an apocalyptic number.

18219955 is a deficient number, since it is larger than the sum of its proper divisors (6566765).

18219955 is a wasteful number, since it uses less digits than its factorization.

18219955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14790.

The product of its digits is 32400, while the sum is 40.

The square root of 18219955 is about 4268.4839228935. The cubic root of 18219955 is about 263.1373116147.

The spelling of 18219955 in words is "eighteen million, two hundred nineteen thousand, nine hundred fifty-five".

Divisors: 1 5 13 19 65 95 247 1235 14753 73765 191789 280307 958945 1401535 3643991 18219955