189982815138 has 48 divisors (see below), whose sum is σ = 437011671096. Its totient is φ = 59442624000.

The previous prime is 189982815133. The next prime is 189982815151. The reversal of 189982815138 is 831518289981.

189982815138 is a `hidden beast` number, since 1 + 8 + 9 + 98 + 28 + 1 + 513 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 177609144969 + 12373670169 = 421437^2 + 111237^2 .

It is not an unprimeable number, because it can be changed into a prime (189982815133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 718113 + ... + 946388.

Almost surely, 2^189982815138 is an apocalyptic number.

189982815138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

189982815138 is an abundant number, since it is smaller than the sum of its proper divisors (247028855958).

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

189982815138 is a wasteful number, since it uses less digits than its factorization.

189982815138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664899 (or 1664896 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 63.

The spelling of 189982815138 in words is "one hundred eighty-nine billion, nine hundred eighty-two million, eight hundred fifteen thousand, one hundred thirty-eight".