18345645 has 24 divisors (see below), whose sum is σ = 32827392. Its totient is φ = 9468000.

The previous prime is 18345581. The next prime is 18345653. The reversal of 18345645 is 54654381.

It is a happy number.

18345645 is a `hidden beast` number, since 1 + 8 + 3 + 4 + 5 + 645 = 666.

It is not a de Polignac number, because 18345645 - 2⁶ = 18345581 is a prime.

It is a super-3 number, since 3×18345645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5181 + ... + 7970.

It is an arithmetic number, because the mean of its divisors is an integer number (1367808).

Almost surely, 2^18345645 is an apocalyptic number.

18345645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18345645 is a deficient number, since it is larger than the sum of its proper divisors (14481747).

18345645 is a wasteful number, since it uses less digits than its factorization.

18345645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13193 (or 13190 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 18345645 is about 4283.1816445255. The cubic root of 18345645 is about 263.7410080565.

The spelling of 18345645 in words is "eighteen million, three hundred forty-five thousand, six hundred forty-five".