18642400 has 72 divisors (see below), whose sum is σ = 52027920. Its totient is φ = 6389760.

The previous prime is 18642391. The next prime is 18642427. The reversal of 18642400 is 424681.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3936 + ... + 7264.

It is an arithmetic number, because the mean of its divisors is an integer number (722610).

Almost surely, 2^18642400 is an apocalyptic number.

18642400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18642400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26013960).

18642400 is an abundant number, since it is smaller than the sum of its proper divisors (33385520).

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

18642400 is a wasteful number, since it uses less digits than its factorization.

18642400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3356 (or 3343 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 18642400 is about 4317.6845646712. The cubic root of 18642400 is about 265.1554801370.

The spelling of 18642400 in words is "eighteen million, six hundred forty-two thousand, four hundred".