138731336 has 8 divisors (see below), whose sum is σ = 260121270. Its totient is φ = 69365664.

The previous prime is 138731311. The next prime is 138731353. The reversal of 138731336 is 633137831.

It can be written as a sum of positive squares in only one way, i.e., 133864900 + 4866436 = 11570^2 + 2206^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 138731296 and 138731305.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8670701 + ... + 8670716.

Almost surely, 2^138731336 is an apocalyptic number.

It is an amenable number.

138731336 is a deficient number, since it is larger than the sum of its proper divisors (121389934).

138731336 is a wasteful number, since it uses less digits than its factorization.

138731336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17341423 (or 17341419 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 138731336 is about 11778.4267200675. The cubic root of 138731336 is about 517.6761888505.

It can be divided in two parts, 1387 and 31336, that added together give a palindrome (32723).

The spelling of 138731336 in words is "one hundred thirty-eight million, seven hundred thirty-one thousand, three hundred thirty-six".