31222340 has 12 divisors (see below), whose sum is σ = 65566956. Its totient is φ = 12488928.

The previous prime is 31222337. The next prime is 31222349. The reversal of 31222340 is 4322213.

It can be written as a sum of positive squares in 2 ways, for example, as 6461764 + 24760576 = 2542^2 + 4976^2 .

It is not an unprimeable number, because it can be changed into a prime (31222349) 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, 780539 + ... + 780578.

It is an arithmetic number, because the mean of its divisors is an integer number (5463913).

Almost surely, 2^31222340 is an apocalyptic number.

It is an amenable number.

31222340 is an abundant number, since it is smaller than the sum of its proper divisors (34344616).

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

31222340 is a wasteful number, since it uses less digits than its factorization.

31222340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1561126 (or 1561124 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 31222340 is about 5587.6954104532. The cubic root of 31222340 is about 314.8873032650.

Adding to 31222340 its reverse (4322213), we get a palindrome (35544553).

The spelling of 31222340 in words is "thirty-one million, two hundred twenty-two thousand, three hundred forty".