857947137 has 16 divisors (see below), whose sum is σ = 1172075520. Its totient is φ = 557926992.

The previous prime is 857947133. The next prime is 857947141. The reversal of 857947137 is 731749758.

It is an interprime number because it is at equal distance from previous prime (857947133) and next prime (857947141).

It is not a de Polignac number, because 857947137 - 2² = 857947133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 857947137.

It is not an unprimeable number, because it can be changed into a prime (857947133) 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, 104268 + ... + 112194.

It is an arithmetic number, because the mean of its divisors is an integer number (73254720).

Almost surely, 2^857947137 is an apocalyptic number.

It is an amenable number.

857947137 is a deficient number, since it is larger than the sum of its proper divisors (314128383).

857947137 is a wasteful number, since it uses less digits than its factorization.

857947137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8812.

The product of its digits is 1481760, while the sum is 51.

The square root of 857947137 is about 29290.7346613225. The cubic root of 857947137 is about 950.2112686177.

The spelling of 857947137 in words is "eight hundred fifty-seven million, nine hundred forty-seven thousand, one hundred thirty-seven".