18078404 has 12 divisors (see below), whose sum is σ = 32373264. Its totient is φ = 8828904.

The previous prime is 18078373. The next prime is 18078407. The reversal of 18078404 is 40487081.

It is not an unprimeable number, because it can be changed into a prime (18078407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52382 + ... + 52725.

It is an arithmetic number, because the mean of its divisors is an integer number (2697772).

Almost surely, 2^18078404 is an apocalyptic number.

It is an amenable number.

18078404 is a deficient number, since it is larger than the sum of its proper divisors (14294860).

18078404 is a wasteful number, since it uses less digits than its factorization.

18078404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105154 (or 105152 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 18078404 is about 4251.8706471387. The cubic root of 18078404 is about 262.4541005159.

The spelling of 18078404 in words is "eighteen million, seventy-eight thousand, four hundred four".