138679659 has 12 divisors (see below), whose sum is σ = 212098536. Its totient is φ = 87014592.

The previous prime is 138679649. The next prime is 138679669. The reversal of 138679659 is 956976831.

It is an interprime number because it is at equal distance from previous prime (138679649) and next prime (138679669).

It is not a de Polignac number, because 138679659 - 2⁹ = 138679147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138679649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453049 + ... + 453354.

It is an arithmetic number, because the mean of its divisors is an integer number (17674878).

Almost surely, 2^138679659 is an apocalyptic number.

138679659 is a deficient number, since it is larger than the sum of its proper divisors (73418877).

138679659 is a wasteful number, since it uses less digits than its factorization.

138679659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906426 (or 906423 counting only the distinct ones).

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

The square root of 138679659 is about 11776.2328017070. The cubic root of 138679659 is about 517.6119032667.

The spelling of 138679659 in words is "one hundred thirty-eight million, six hundred seventy-nine thousand, six hundred fifty-nine".