31879438 has 16 divisors (see below), whose sum is σ = 48820464. Its totient is φ = 15609600.

The previous prime is 31879433. The next prime is 31879453. The reversal of 31879438 is 83497813.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31879394 and 31879403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31879433) 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 in 7 ways as a sum of consecutive naturals, for example, 18781 + ... + 20407.

It is an arithmetic number, because the mean of its divisors is an integer number (3051279).

Almost surely, 2^31879438 is an apocalyptic number.

31879438 is a deficient number, since it is larger than the sum of its proper divisors (16941026).

31879438 is a wasteful number, since it uses less digits than its factorization.

31879438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827.

The product of its digits is 145152, while the sum is 43.

The square root of 31879438 is about 5646.1879175245. The cubic root of 31879438 is about 317.0809997777.

The spelling of 31879438 in words is "thirty-one million, eight hundred seventy-nine thousand, four hundred thirty-eight".