679038421 has 6 divisors (see below), whose sum is σ = 680527490. Its totient is φ = 677552016.

The previous prime is 679038403. The next prime is 679038439. The reversal of 679038421 is 124830976.

It is an interprime number because it is at equal distance from previous prime (679038403) and next prime (679038439).

It can be written as a sum of positive squares in 3 ways, for example, as 84897796 + 594140625 = 9214^2 + 24375^2 .

It is not a de Polignac number, because 679038421 - 2²¹ = 676941269 is a prime.

It is a super-2 number, since 2×679038421² = 922186354388346482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679039421) 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, 634675 + ... + 635743.

Almost surely, 2^679038421 is an apocalyptic number.

It is an amenable number.

679038421 is a deficient number, since it is larger than the sum of its proper divisors (1489069).

679038421 is an frugal number, since it uses more digits than its factorization.

679038421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663 (or 1866 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 679038421 is about 26058.3656624893. The cubic root of 679038421 is about 878.9512389887.

The spelling of 679038421 in words is "six hundred seventy-nine million, thirty-eight thousand, four hundred twenty-one".