138865036 has 24 divisors (see below), whose sum is σ = 248699360. Its totient is φ = 67824000.

The previous prime is 138864983. The next prime is 138865037. The reversal of 138865036 is 630568831.

It is a self number, because there is not a number n which added to its sum of digits gives 138865036.

It is not an unprimeable number, because it can be changed into a prime (138865037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34960 + ... + 38728.

Almost surely, 2^138865036 is an apocalyptic number.

It is an amenable number.

138865036 is a deficient number, since it is larger than the sum of its proper divisors (109834324).

138865036 is a wasteful number, since it uses less digits than its factorization.

138865036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985 (or 3983 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 138865036 is about 11784.1009839529. The cubic root of 138865036 is about 517.8424360396.

The spelling of 138865036 in words is "one hundred thirty-eight million, eight hundred sixty-five thousand, thirty-six".