138962817 has 64 divisors (see below), whose sum is σ = 245145600. Its totient is φ = 76152960.

The previous prime is 138962779. The next prime is 138962821. The reversal of 138962817 is 718269831.

138962817 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 628 + 17 = 666.

It is not a de Polignac number, because 138962817 - 2⁷ = 138962689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138962897) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 612058 + ... + 612284.

It is an arithmetic number, because the mean of its divisors is an integer number (3830400).

Almost surely, 2^138962817 is an apocalyptic number.

It is an amenable number.

138962817 is a deficient number, since it is larger than the sum of its proper divisors (106182783).

138962817 is a wasteful number, since it uses less digits than its factorization.

138962817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 357 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 138962817 is about 11788.2491066316. The cubic root of 138962817 is about 517.9639527596.

The spelling of 138962817 in words is "one hundred thirty-eight million, nine hundred sixty-two thousand, eight hundred seventeen".