18394400 has 36 divisors (see below), whose sum is σ = 44907282. Its totient is φ = 7357440.

The previous prime is 18394379. The next prime is 18394403. The reversal of 18394400 is 449381.

It can be written as a sum of positive squares in 3 ways, for example, as 16096144 + 2298256 = 4012^2 + 1516^2 .

It is not an unprimeable number, because it can be changed into a prime (18394403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10697 + ... + 12296.

Almost surely, 2^18394400 is an apocalyptic number.

18394400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18394400 is an abundant number, since it is smaller than the sum of its proper divisors (26512882).

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

18394400 is a wasteful number, since it uses less digits than its factorization.

18394400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23013 (or 23000 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18394400 is about 4288.8693148661. The cubic root of 18394400 is about 263.9744389087.

The spelling of 18394400 in words is "eighteen million, three hundred ninety-four thousand, four hundred".