138660439950 has 96 divisors (see below), whose sum is σ = 391405885920. Its totient is φ = 36074246400.

The previous prime is 138660439937. The next prime is 138660440003. The reversal of 138660439950 is 59934066831.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1197229 + ... + 1307928.

It is an arithmetic number, because the mean of its divisors is an integer number (4077144645).

Almost surely, 2^138660439950 is an apocalyptic number.

138660439950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138660439950 is an abundant number, since it is smaller than the sum of its proper divisors (252745445970).

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

138660439950 is a wasteful number, since it uses less digits than its factorization.

138660439950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2505219 (or 2505208 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 138660439950 in words is "one hundred thirty-eight billion, six hundred sixty million, four hundred thirty-nine thousand, nine hundred fifty".