138702857 has 8 divisors (see below), whose sum is σ = 145070784. Its totient is φ = 132363088.

The previous prime is 138702833. The next prime is 138702859. The reversal of 138702857 is 758207831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138702857 - 2⁸ = 138702601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138702859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3383 + ... + 16995.

It is an arithmetic number, because the mean of its divisors is an integer number (18133848).

Almost surely, 2^138702857 is an apocalyptic number.

It is an amenable number.

138702857 is a deficient number, since it is larger than the sum of its proper divisors (6367927).

138702857 is a wasteful number, since it uses less digits than its factorization.

138702857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14079.

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 138702857 is about 11777.2177104781. The cubic root of 138702857 is about 517.6407632825.

The spelling of 138702857 in words is "one hundred thirty-eight million, seven hundred two thousand, eight hundred fifty-seven".