138776865 has 16 divisors (see below), whose sum is σ = 235104768. Its totient is φ = 69660416.

The previous prime is 138776857. The next prime is 138776873. The reversal of 138776865 is 568677831.

It is an interprime number because it is at equal distance from previous prime (138776857) and next prime (138776873).

It is a cyclic number.

It is not a de Polignac number, because 138776865 - 2³ = 138776857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 271857 + ... + 272366.

It is an arithmetic number, because the mean of its divisors is an integer number (14694048).

Almost surely, 2^138776865 is an apocalyptic number.

138776865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138776865 is a deficient number, since it is larger than the sum of its proper divisors (96327903).

138776865 is a wasteful number, since it uses less digits than its factorization.

138776865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544248.

The product of its digits is 1693440, while the sum is 51.

The square root of 138776865 is about 11780.3592899368. The cubic root of 138776865 is about 517.7328131673.

The spelling of 138776865 in words is "one hundred thirty-eight million, seven hundred seventy-six thousand, eight hundred sixty-five".