918731 has 10 divisors (see below), whose sum is σ = 1064892. Its totient is φ = 786080.

The previous prime is 918683. The next prime is 918733. The reversal of 918731 is 137819.

It is not a de Polignac number, because 918731 - 2¹⁴ = 902347 is a prime.

It is a super-2 number, since 2×918731² = 1688133300722, which contains 22 as substring.

It is a Duffinian number.

Its product of digits (1512) is a multiple of the sum of its prime divisors (28).

It is a junction number, because it is equal to n+sod(n) for n = 918694 and 918703.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 918731.

It is not an unprimeable number, because it can be changed into a prime (918733) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 54035 + ... + 54051.

918731 is a Friedman number, since it can be written as 11*(9+8)^(7-3), using all its digits and the basic arithmetic operations.

2⁹¹⁸⁷³¹ is an apocalyptic number.

918731 is a deficient number, since it is larger than the sum of its proper divisors (146161).

918731 is an frugal number, since it uses more digits than its factorization.

918731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 28 counting only the distinct ones).

The product of its digits is 1512, while the sum is 29.

The square root of 918731 is about 958.5045644127. The cubic root of 918731 is about 97.2141441028.

The spelling of 918731 in words is "nine hundred eighteen thousand, seven hundred thirty-one".