18805040 has 40 divisors (see below), whose sum is σ = 43919808. Its totient is φ = 7488000.

The previous prime is 18805037. The next prime is 18805049. The reversal of 18805040 is 4050881.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (18805049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24665 + ... + 25415.

Almost surely, 2^18805040 is an apocalyptic number.

18805040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18805040 is the 2504-th octagonal number.

It is an amenable number.

18805040 is an abundant number, since it is smaller than the sum of its proper divisors (25114768).

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

18805040 is a wasteful number, since it uses less digits than its factorization.

18805040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 18805040 is about 4336.4778334496. The cubic root of 18805040 is about 265.9243382522.

The spelling of 18805040 in words is "eighteen million, eight hundred five thousand, forty".