18957645 has 56 divisors (see below), whose sum is σ = 39033216. Its totient is φ = 8654688.

The previous prime is 18957637. The next prime is 18957661. The reversal of 18957645 is 54675981.

It is not a de Polignac number, because 18957645 - 2³ = 18957637 is a prime.

It is a super-3 number, since 3×18957645³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18957645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 25144 + ... + 25886.

Almost surely, 2^18957645 is an apocalyptic number.

18957645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18957645 is an abundant number, since it is smaller than the sum of its proper divisors (20075571).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18957645 is an frugal number, since it uses more digits than its factorization.

18957645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 758 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 18957645 is about 4354.0377811866. The cubic root of 18957645 is about 266.6417363847.

The spelling of 18957645 in words is "eighteen million, nine hundred fifty-seven thousand, six hundred forty-five".