818957 has 4 divisors (see below), whose sum is σ = 862080. Its totient is φ = 775836.

The previous prime is 818947. The next prime is 818959. The reversal of 818957 is 759818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 759818 = 2 ⋅379909.

It is a cyclic number.

It is not a de Polignac number, because 818957 - 2¹⁰ = 817933 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 818957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (818959) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21533 + ... + 21570.

It is an arithmetic number, because the mean of its divisors is an integer number (215520).

2⁸¹⁸⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

818957 is a deficient number, since it is larger than the sum of its proper divisors (43123).

818957 is a wasteful number, since it uses less digits than its factorization.

818957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43122.

The product of its digits is 20160, while the sum is 38.

The square root of 818957 is about 904.9624301594. The cubic root of 818957 is about 93.5593149330.

The spelling of 818957 in words is "eight hundred eighteen thousand, nine hundred fifty-seven".