920857 has 6 divisors (see below), whose sum is σ = 1071258. Its totient is φ = 789264.

The previous prime is 920849. The next prime is 920863. The reversal of 920857 is 758029.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 67081 = 924^2 + 259^2 .

It is not a de Polignac number, because 920857 - 2³ = 920849 is a prime.

It is a super-2 number, since 2×920857² = 1695955228898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9348 + ... + 9445.

It is an arithmetic number, because the mean of its divisors is an integer number (178543).

2⁹²⁰⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

920857 is a deficient number, since it is larger than the sum of its proper divisors (150401).

920857 is a wasteful number, since it uses less digits than its factorization.

920857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18807 (or 18800 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 920857 is about 959.6129428056. The cubic root of 920857 is about 97.2890728374.

The spelling of 920857 in words is "nine hundred twenty thousand, eight hundred fifty-seven".