31403242 has 24 divisors (see below), whose sum is σ = 51999084. Its totient is φ = 14212224.

The previous prime is 31403173. The next prime is 31403249. The reversal of 31403242 is 24230413.

It can be written as a sum of positive squares in 6 ways, for example, as 1252161 + 30151081 = 1119^2 + 5491^2 .

It is a super-2 number, since 2×31403242² = 1972327216221128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31403249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17038 + ... + 18790.

Almost surely, 2^31403242 is an apocalyptic number.

31403242 is a deficient number, since it is larger than the sum of its proper divisors (20595842).

31403242 is a wasteful number, since it uses less digits than its factorization.

31403242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834 (or 1821 counting only the distinct ones).

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

The square root of 31403242 is about 5603.8595628370. The cubic root of 31403242 is about 315.4942840344.

Adding to 31403242 its reverse (24230413), we get a palindrome (55633655).

The spelling of 31403242 in words is "thirty-one million, four hundred three thousand, two hundred forty-two".