31923949 has 4 divisors (see below), whose sum is σ = 31964220. Its totient is φ = 31883680.

The previous prime is 31923929. The next prime is 31923989. The reversal of 31923949 is 94932913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94932913 = 17 ⋅5584289.

It can be written as a sum of positive squares in 2 ways, for example, as 19624900 + 12299049 = 4430^2 + 3507^2 .

It is a cyclic number.

It is not a de Polignac number, because 31923949 - 2⁵ = 31923917 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31923919) 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, 18922 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (7991055).

Almost surely, 2^31923949 is an apocalyptic number.

It is an amenable number.

31923949 is a deficient number, since it is larger than the sum of its proper divisors (40271).

31923949 is an equidigital number, since it uses as much as digits as its factorization.

31923949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40270.

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

The square root of 31923949 is about 5650.1282286334. The cubic root of 31923949 is about 317.2285037254.

The spelling of 31923949 in words is "thirty-one million, nine hundred twenty-three thousand, nine hundred forty-nine".