857000138 has 8 divisors (see below), whose sum is σ = 1286681760. Its totient is φ = 428106220.

The previous prime is 857000113. The next prime is 857000143. The reversal of 857000138 is 831000758.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194198 + ... + 198561.

It is an arithmetic number, because the mean of its divisors is an integer number (160835220).

Almost surely, 2^857000138 is an apocalyptic number.

857000138 is a deficient number, since it is larger than the sum of its proper divisors (429681622).

857000138 is a wasteful number, since it uses less digits than its factorization.

857000138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393852.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 857000138 is about 29274.5646936039. The cubic root of 857000138 is about 949.8615266313.

The spelling of 857000138 in words is "eight hundred fifty-seven million, one hundred thirty-eight", and thus it is an aban number.