31890222 has 48 divisors (see below), whose sum is σ = 85044960. Its totient is φ = 8410176.

The previous prime is 31890217. The next prime is 31890223. The reversal of 31890222 is 22209813.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31890223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8097 + ... + 11372.

It is an arithmetic number, because the mean of its divisors is an integer number (1771770).

Almost surely, 2^31890222 is an apocalyptic number.

31890222 is an abundant number, since it is smaller than the sum of its proper divisors (53154738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31890222 is a wasteful number, since it uses less digits than its factorization.

31890222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19497 (or 19494 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 31890222 is about 5647.1428173900. The cubic root of 31890222 is about 317.1167492161.

The spelling of 31890222 in words is "thirty-one million, eight hundred ninety thousand, two hundred twenty-two".