18938331000 has 192 divisors, whose sum is σ = 65220966720. Its totient is φ = 4954809600.

The previous prime is 18938330989. The next prime is 18938331001. The reversal of 18938331000 is 13383981.

It is a super-2 number, since 2×18938331000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938331001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 457149 + ... + 496851.

It is an arithmetic number, because the mean of its divisors is an integer number (339692535).

Almost surely, 2^18938331000 is an apocalyptic number.

18938331000 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 18938331000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32610483360).

18938331000 is an abundant number, since it is smaller than the sum of its proper divisors (46282635720).

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

18938331000 is a wasteful number, since it uses less digits than its factorization.

18938331000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39783 (or 39766 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 18938331000 in words is "eighteen billion, nine hundred thirty-eight million, three hundred thirty-one thousand".