31923394 has 4 divisors (see below), whose sum is σ = 47885094. Its totient is φ = 15961696.

The previous prime is 31923391. The next prime is 31923407. The reversal of 31923394 is 49332913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49332913 = 7 ⋅7047559.

It can be written as a sum of positive squares in only one way, i.e., 31304025 + 619369 = 5595^2 + 787^2 .

It is not an unprimeable number, because it can be changed into a prime (31923391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7980847 + ... + 7980850.

Almost surely, 2^31923394 is an apocalyptic number.

31923394 is a deficient number, since it is larger than the sum of its proper divisors (15961700).

31923394 is a wasteful number, since it uses less digits than its factorization.

31923394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15961699.

The product of its digits is 17496, while the sum is 34.

The square root of 31923394 is about 5650.0791144903. The cubic root of 31923394 is about 317.2266653685.

The spelling of 31923394 in words is "thirty-one million, nine hundred twenty-three thousand, three hundred ninety-four".