18400940 has 24 divisors (see below), whose sum is σ = 38852352. Its totient is φ = 7320320.

The previous prime is 18400939. The next prime is 18400961. The reversal of 18400940 is 4900481.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1412 + ... + 6228.

It is an arithmetic number, because the mean of its divisors is an integer number (1618848).

Almost surely, 2^18400940 is an apocalyptic number.

18400940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18400940 is an abundant number, since it is smaller than the sum of its proper divisors (20451412).

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

18400940 is a wasteful number, since it uses less digits than its factorization.

18400940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5017 (or 5015 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18400940 is about 4289.6316858211. The cubic root of 18400940 is about 264.0057199557.

The spelling of 18400940 in words is "eighteen million, four hundred thousand, nine hundred forty".