31420344 has 16 divisors (see below), whose sum is σ = 78550920. Its totient is φ = 10473440.

The previous prime is 31420343. The next prime is 31420379. The reversal of 31420344 is 44302413.

It is a self number, because there is not a number n which added to its sum of digits gives 31420344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31420343) 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, 654567 + ... + 654614.

Almost surely, 2^31420344 is an apocalyptic number.

It is an amenable number.

31420344 is an abundant number, since it is smaller than the sum of its proper divisors (47130576).

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

31420344 is a wasteful number, since it uses less digits than its factorization.

31420344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309190 (or 1309186 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 31420344 is about 5605.3852677581. The cubic root of 31420344 is about 315.5515456814.

Adding to 31420344 its reverse (44302413), we get a palindrome (75722757).

The spelling of 31420344 in words is "thirty-one million, four hundred twenty thousand, three hundred forty-four".