18949400000 has 84 divisors (see below), whose sum is σ = 47000882376. Its totient is φ = 7579680000.

The previous prime is 18949399999. The next prime is 18949400021. The reversal of 18949400000 is 494981.

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, 152627 + ... + 247373.

It is an arithmetic number, because the mean of its divisors is an integer number (559534314).

Almost surely, 2^18949400000 is an apocalyptic number.

18949400000 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 18949400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23500441188).

18949400000 is an abundant number, since it is smaller than the sum of its proper divisors (28051482376).

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

18949400000 is an frugal number, since it uses more digits than its factorization.

18949400000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94784 (or 94754 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

Adding to 18949400000 its reverse (494981), we get a palindrome (18949894981).

The spelling of 18949400000 in words is "eighteen billion, nine hundred forty-nine million, four hundred thousand".