31421228 has 24 divisors (see below), whose sum is σ = 57200640. Its totient is φ = 15086160.

The previous prime is 31421213. The next prime is 31421233. The reversal of 31421228 is 82212413.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16325 + ... + 18147.

It is an arithmetic number, because the mean of its divisors is an integer number (2383360).

Almost surely, 2^31421228 is an apocalyptic number.

It is an amenable number.

31421228 is a deficient number, since it is larger than the sum of its proper divisors (25779412).

31421228 is a wasteful number, since it uses less digits than its factorization.

31421228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997 (or 1995 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 31421228 is about 5605.4641199458. The cubic root of 31421228 is about 315.5545049632.

The spelling of 31421228 in words is "thirty-one million, four hundred twenty-one thousand, two hundred twenty-eight".