31929428 has 12 divisors (see below), whose sum is σ = 58306080. Its totient is φ = 15270552.

The previous prime is 31929427. The next prime is 31929439. The reversal of 31929428 is 82492913.

It is a junction number, because it is equal to n+sod(n) for n = 31929391 and 31929400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31929421) 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 3 ways as a sum of consecutive naturals, for example, 173438 + ... + 173621.

It is an arithmetic number, because the mean of its divisors is an integer number (4858840).

Almost surely, 2^31929428 is an apocalyptic number.

It is an amenable number.

31929428 is a deficient number, since it is larger than the sum of its proper divisors (26376652).

31929428 is a wasteful number, since it uses less digits than its factorization.

31929428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347086 (or 347084 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 31929428 is about 5650.6130640843. The cubic root of 31929428 is about 317.2466509744.

The spelling of 31929428 in words is "thirty-one million, nine hundred twenty-nine thousand, four hundred twenty-eight".