138898667 has 2 divisors, whose sum is σ = 138898668. Its totient is φ = 138898666.

The previous prime is 138898621. The next prime is 138898681. The reversal of 138898667 is 766898831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138898667 - 2⁸ = 138898411 is a prime.

It is not a weakly prime, because it can be changed into another prime (138808667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69449333 + 69449334.

It is an arithmetic number, because the mean of its divisors is an integer number (69449334).

Almost surely, 2^138898667 is an apocalyptic number.

138898667 is a deficient number, since it is larger than the sum of its proper divisors (1).

138898667 is an equidigital number, since it uses as much as digits as its factorization.

138898667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3483648, while the sum is 56.

The square root of 138898667 is about 11785.5278625949. The cubic root of 138898667 is about 517.8842371863.

The spelling of 138898667 in words is "one hundred thirty-eight million, eight hundred ninety-eight thousand, six hundred sixty-seven".