31429939 has 8 divisors (see below), whose sum is σ = 33563520. Its totient is φ = 29366400.

The previous prime is 31429921. The next prime is 31429963. The reversal of 31429939 is 93992413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31429939 - 2⁵ = 31429907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31429999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16582 + ... + 18379.

It is an arithmetic number, because the mean of its divisors is an integer number (4195440).

Almost surely, 2^31429939 is an apocalyptic number.

31429939 is a deficient number, since it is larger than the sum of its proper divisors (2133581).

31429939 is a wasteful number, since it uses less digits than its factorization.

31429939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35021.

The product of its digits is 52488, while the sum is 40.

The square root of 31429939 is about 5606.2410758011. The cubic root of 31429939 is about 315.5836629718.

The spelling of 31429939 in words is "thirty-one million, four hundred twenty-nine thousand, nine hundred thirty-nine".