138147989479020 has 36 divisors (see below), whose sum is σ = 419048901420240. Its totient is φ = 36839463861024.

The previous prime is 138147989478971. The next prime is 138147989479021. The reversal of 138147989479020 is 20974989741831.

138147989479020 is a `hidden beast` number, since 1 + 3 + 8 + 1 + 4 + 79 + 89 + 479 + 0 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×138147989479020² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138147989479020.

It is not an unprimeable number, because it can be changed into a prime (138147989479021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 383744415040 + ... + 383744415399.

Almost surely, 2^{138147989479020} is an apocalyptic number.

138147989479020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138147989479020 is an abundant number, since it is smaller than the sum of its proper divisors (280900911941220).

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

138147989479020 is a wasteful number, since it uses less digits than its factorization.

138147989479020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767488830454 (or 767488830449 counting only the distinct ones).

The product of its (nonzero) digits is 219469824, while the sum is 72.

The spelling of 138147989479020 in words is "one hundred thirty-eight trillion, one hundred forty-seven billion, nine hundred eighty-nine million, four hundred seventy-nine thousand, twenty".