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18380427 = 3132331661
BaseRepresentation
bin100011000011…
…1011010001011
31021120211012120
41012013122023
514201133202
61453542323
7312142152
oct106073213
937524176
1018380427
11a41453a
1261a49a3
133a671c0
142626599
1519310bc
hex118768b

18380427 has 32 divisors (see below), whose sum is σ = 28471296. Its totient is φ = 10454400.

The previous prime is 18380419. The next prime is 18380437. The reversal of 18380427 is 72408381.

It is not a de Polignac number, because 18380427 - 23 = 18380419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18380437) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27477 + ... + 28137.

It is an arithmetic number, because the mean of its divisors is an integer number (889728).

Almost surely, 218380427 is an apocalyptic number.

18380427 is a deficient number, since it is larger than the sum of its proper divisors (10090869).

18380427 is a wasteful number, since it uses less digits than its factorization.

18380427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 18380427 is about 4287.2400212724. The cubic root of 18380427 is about 263.9075807127.

The spelling of 18380427 in words is "eighteen million, three hundred eighty thousand, four hundred twenty-seven".

Divisors: 1 3 13 23 31 39 69 93 299 403 661 713 897 1209 1983 2139 8593 9269 15203 20491 25779 27807 45609 61473 197639 266383 471293 592917 799149 1413879 6126809 18380427