18326398400 has 84 divisors (see below), whose sum is σ = 45131153832. Its totient is φ = 7324584960.

The previous prime is 18326398397. The next prime is 18326398439. The reversal of 18326398400 is 489362381.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2320859 + ... + 2328741.

Almost surely, 2^18326398400 is an apocalyptic number.

18326398400 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 18326398400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22565576916).

18326398400 is an abundant number, since it is smaller than the sum of its proper divisors (26804755432).

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

18326398400 is a wasteful number, since it uses less digits than its factorization.

18326398400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9358 (or 9343 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The spelling of 18326398400 in words is "eighteen billion, three hundred twenty-six million, three hundred ninety-eight thousand, four hundred".