18078400 has 42 divisors (see below), whose sum is σ = 44488100. Its totient is φ = 7230720.

The previous prime is 18078373. The next prime is 18078407. The reversal of 18078400 is 487081.

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

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 5 ways as a sum of consecutive naturals, for example, 4050 + ... + 7249.

Almost surely, 2^18078400 is an apocalyptic number.

18078400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18078400 is an abundant number, since it is smaller than the sum of its proper divisors (26409700).

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

18078400 is a wasteful number, since it uses less digits than its factorization.

18078400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11321 (or 11306 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 18078400 is about 4251.8701767575. The cubic root of 18078400 is about 262.4540811592.

The spelling of 18078400 in words is "eighteen million, seventy-eight thousand, four hundred".