679731 has 16 divisors (see below), whose sum is σ = 1011360. Its totient is φ = 403200.

The previous prime is 679709. The next prime is 679733. The reversal of 679731 is 137976.

It is not a de Polignac number, because 679731 - 2⁵ = 679699 is a prime.

It is a super-2 number, since 2×679731² = 924068464722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 679692 and 679701.

It is not an unprimeable number, because it can be changed into a prime (679733) 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, 831 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (63210).

2⁶⁷⁹⁷³¹ is an apocalyptic number.

679731 is a deficient number, since it is larger than the sum of its proper divisors (331629).

679731 is a wasteful number, since it uses less digits than its factorization.

679731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646.

The product of its digits is 7938, while the sum is 33.

The square root of 679731 is about 824.4580037819. The cubic root of 679731 is about 87.9249963532.

The spelling of 679731 in words is "six hundred seventy-nine thousand, seven hundred thirty-one".