18540400 has 30 divisors (see below), whose sum is σ = 44544272. Its totient is φ = 7416000.

The previous prime is 18540383. The next prime is 18540427. The reversal of 18540400 is 404581.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22776 + ... + 23575.

Almost surely, 2^18540400 is an apocalyptic number.

18540400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18540400 is an abundant number, since it is smaller than the sum of its proper divisors (26003872).

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

18540400 is a wasteful number, since it uses less digits than its factorization.

18540400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46369 (or 46358 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18540400 is about 4305.8564769393. The cubic root of 18540400 is about 264.6710050393.

Adding to 18540400 its reverse (404581), we get a palindrome (18944981).

The spelling of 18540400 in words is "eighteen million, five hundred forty thousand, four hundred".