31030240 has 24 divisors (see below), whose sum is σ = 73309320. Its totient is φ = 12412032.

The previous prime is 31030213. The next prime is 31030267. The reversal of 31030240 is 4203013.

It is an interprime number because it is at equal distance from previous prime (31030213) and next prime (31030267).

It is a self number, because there is not a number n which added to its sum of digits gives 31030240.

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, 96810 + ... + 97129.

It is an arithmetic number, because the mean of its divisors is an integer number (3054555).

Almost surely, 2^31030240 is an apocalyptic number.

It is an amenable number.

31030240 is an abundant number, since it is smaller than the sum of its proper divisors (42279080).

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

31030240 is a wasteful number, since it uses less digits than its factorization.

31030240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193954 (or 193946 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 31030240 is about 5570.4793330556. The cubic root of 31030240 is about 314.2401775820.

Adding to 31030240 its reverse (4203013), we get a palindrome (35233253).

The spelling of 31030240 in words is "thirty-one million, thirty thousand, two hundred forty".