138976569 has 6 divisors (see below), whose sum is σ = 200743946. Its totient is φ = 92651040.

The previous prime is 138976567. The next prime is 138976573. The reversal of 138976569 is 965679831.

138976569 is a `hidden beast` number, since 1 + 3 + 8 + 9 + 76 + 569 = 666.

It can be written as a sum of positive squares in only one way, i.e., 138368169 + 608400 = 11763^2 + 780^2 .

It is not a de Polignac number, because 138976569 - 2¹ = 138976567 is a prime.

It is a super-2 number, since 2×138976569² = 38628973462023522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138976567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7720912 + ... + 7720929.

Almost surely, 2^138976569 is an apocalyptic number.

It is an amenable number.

138976569 is a deficient number, since it is larger than the sum of its proper divisors (61767377).

138976569 is a wasteful number, since it uses less digits than its factorization.

138976569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15441847 (or 15441844 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 138976569 is about 11788.8323849311. The cubic root of 138976569 is about 517.9810383980.

The spelling of 138976569 in words is "one hundred thirty-eight million, nine hundred seventy-six thousand, five hundred sixty-nine".