31440304 has 20 divisors (see below), whose sum is σ = 69618064. Its totient is φ = 13474368.

The previous prime is 31440257. The next prime is 31440337. The reversal of 31440304 is 40304413.

It is a super-2 number, since 2×31440304² = 1976985431224832, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140247 + ... + 140470.

Almost surely, 2^31440304 is an apocalyptic number.

It is an amenable number.

31440304 is an abundant number, since it is smaller than the sum of its proper divisors (38177760).

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

31440304 is a wasteful number, since it uses less digits than its factorization.

31440304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280732 (or 280726 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 31440304 is about 5607.1654157872. The cubic root of 31440304 is about 315.6183503353.

Adding to 31440304 its reverse (40304413), we get a palindrome (71744717).

The spelling of 31440304 in words is "thirty-one million, four hundred forty thousand, three hundred four".