9979431 has 16 divisors (see below), whose sum is σ = 16589568. Its totient is φ = 5184000.

The previous prime is 9979399. The next prime is 9979433. The reversal of 9979431 is 1349799.

It is not a de Polignac number, because 9979431 - 2⁵ = 9979399 is a prime.

It is a super-2 number, since 2×9979431² = 199178086167522, which contains 22 as substring.

9979431 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979433) 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, 21370 + ... + 21831.

It is an arithmetic number, because the mean of its divisors is an integer number (1036848).

Almost surely, 2^9979431 is an apocalyptic number.

9979431 is a deficient number, since it is larger than the sum of its proper divisors (6610137).

9979431 is a wasteful number, since it uses less digits than its factorization.

9979431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43222.

The product of its digits is 61236, while the sum is 42.

The square root of 9979431 is about 3159.0237416012. The cubic root of 9979431 is about 215.2956523850.

The spelling of 9979431 in words is "nine million, nine hundred seventy-nine thousand, four hundred thirty-one".