18939849600 has 768 divisors, whose sum is σ = 77041497600. Its totient is φ = 3991142400.

The previous prime is 18939849571. The next prime is 18939849601. The reversal of 18939849600 is 694893981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18939849601) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67401460 + ... + 67401740.

It is an arithmetic number, because the mean of its divisors is an integer number (100314450).

Almost surely, 2^18939849600 is an apocalyptic number.

18939849600 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 18939849600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38520748800).

18939849600 is an abundant number, since it is smaller than the sum of its proper divisors (58101648000).

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

18939849600 is a wasteful number, since it uses less digits than its factorization.

18939849600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 18939849600 in words is "eighteen billion, nine hundred thirty-nine million, eight hundred forty-nine thousand, six hundred".