31909402 has 8 divisors (see below), whose sum is σ = 54701856. Its totient is φ = 13675452.

The previous prime is 31909399. The next prime is 31909403. The reversal of 31909402 is 20490913.

31909402 = 1054² + 1055² + ... + 1081².

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (31909403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139608 + ... + 1139635.

It is an arithmetic number, because the mean of its divisors is an integer number (6837732).

Almost surely, 2^31909402 is an apocalyptic number.

31909402 is a deficient number, since it is larger than the sum of its proper divisors (22792454).

31909402 is a wasteful number, since it uses less digits than its factorization.

31909402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279252.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 31909402 is about 5648.8407660333. The cubic root of 31909402 is about 317.1803118579.

The spelling of 31909402 in words is "thirty-one million, nine hundred nine thousand, four hundred two".