31425340 has 12 divisors (see below), whose sum is σ = 65993256. Its totient is φ = 12570128.

The previous prime is 31425323. The next prime is 31425353. The reversal of 31425340 is 4352413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785614 + ... + 785653.

It is an arithmetic number, because the mean of its divisors is an integer number (5499438).

Almost surely, 2^31425340 is an apocalyptic number.

It is an amenable number.

31425340 is an abundant number, since it is smaller than the sum of its proper divisors (34567916).

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

31425340 is a wasteful number, since it uses less digits than its factorization.

31425340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571276 (or 1571274 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 31425340 is about 5605.8308929186. The cubic root of 31425340 is about 315.5682695804.

Adding to 31425340 its reverse (4352413), we get a palindrome (35777753).

The spelling of 31425340 in words is "thirty-one million, four hundred twenty-five thousand, three hundred forty".