138690651 has 16 divisors (see below), whose sum is σ = 205153920. Its totient is φ = 82629120.

The previous prime is 138690647. The next prime is 138690653. The reversal of 138690651 is 156096831.

It is not a de Polignac number, because 138690651 - 2² = 138690647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138690653) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33670 + ... + 37563.

It is an arithmetic number, because the mean of its divisors is an integer number (12822120).

Almost surely, 2^138690651 is an apocalyptic number.

138690651 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138690651 is a deficient number, since it is larger than the sum of its proper divisors (66463269).

138690651 is a wasteful number, since it uses less digits than its factorization.

138690651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71306.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 138690651 is about 11776.6994951896. The cubic root of 138690651 is about 517.6255785232.

The spelling of 138690651 in words is "one hundred thirty-eight million, six hundred ninety thousand, six hundred fifty-one".