138697958 has 16 divisors (see below), whose sum is σ = 248106240. Its totient is φ = 56857416.

The previous prime is 138697943. The next prime is 138697969. The reversal of 138697958 is 859796831.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215048 + ... + 215691.

It is an arithmetic number, because the mean of its divisors is an integer number (15506640).

Almost surely, 2^138697958 is an apocalyptic number.

138697958 is a deficient number, since it is larger than the sum of its proper divisors (109408282).

138697958 is a wasteful number, since it uses less digits than its factorization.

138697958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430771.

The product of its digits is 3265920, while the sum is 56.

The square root of 138697958 is about 11777.0097223361. The cubic root of 138697958 is about 517.6346688348.

The spelling of 138697958 in words is "one hundred thirty-eight million, six hundred ninety-seven thousand, nine hundred fifty-eight".