31939293 has 4 divisors (see below), whose sum is σ = 42585728. Its totient is φ = 21292860.

The previous prime is 31939267. The next prime is 31939307. The reversal of 31939293 is 39293913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31939293 - 2⁵ = 31939261 is a prime.

It is a super-3 number, since 3×31939293³ (a number of 23 digits) contains 333 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 (31939213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5323213 + ... + 5323218.

It is an arithmetic number, because the mean of its divisors is an integer number (10646432).

Almost surely, 2^31939293 is an apocalyptic number.

It is an amenable number.

31939293 is a deficient number, since it is larger than the sum of its proper divisors (10646435).

31939293 is a wasteful number, since it uses less digits than its factorization.

31939293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10646434.

The product of its digits is 39366, while the sum is 39.

The square root of 31939293 is about 5651.4859108026. The cubic root of 31939293 is about 317.2793200631.

The spelling of 31939293 in words is "thirty-one million, nine hundred thirty-nine thousand, two hundred ninety-three".