31140424 has 32 divisors (see below), whose sum is σ = 67366080. Its totient is φ = 13218624.

The previous prime is 31140419. The next prime is 31140467. The reversal of 31140424 is 42404113.

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, 3394 + ... + 8590.

It is an arithmetic number, because the mean of its divisors is an integer number (2105190).

Almost surely, 2^31140424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31140424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33683040).

31140424 is an abundant number, since it is smaller than the sum of its proper divisors (36225656).

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

31140424 is a wasteful number, since it uses less digits than its factorization.

31140424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5317 (or 5313 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 31140424 is about 5580.3605618275. The cubic root of 31140424 is about 314.6116790426.

Adding to 31140424 its reverse (42404113), we get a palindrome (73544537).

The spelling of 31140424 in words is "thirty-one million, one hundred forty thousand, four hundred twenty-four".