138031518040 has 64 divisors (see below), whose sum is σ = 335643184800. Its totient is φ = 50785339392.

The previous prime is 138031518019. The next prime is 138031518103. The reversal of 138031518040 is 40815130831.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138031517987 and 138031518005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321825 + ... + 616144.

Almost surely, 2^138031518040 is an apocalyptic number.

138031518040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138031518040 is an abundant number, since it is smaller than the sum of its proper divisors (197611666760).

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

138031518040 is a wasteful number, since it uses less digits than its factorization.

138031518040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938276 (or 938272 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

Adding to 138031518040 its reverse (40815130831), we get a palindrome (178846648871).

The spelling of 138031518040 in words is "one hundred thirty-eight billion, thirty-one million, five hundred eighteen thousand, forty".