31004240 has 40 divisors (see below), whose sum is σ = 72316800. Its totient is φ = 12361856.

The previous prime is 31004231. The next prime is 31004249. The reversal of 31004240 is 4240013.

It is an interprime number because it is at equal distance from previous prime (31004231) and next prime (31004249).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×31004240² = 1922525795955200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31004249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47597 + ... + 48243.

It is an arithmetic number, because the mean of its divisors is an integer number (1807920).

Almost surely, 2^31004240 is an apocalyptic number.

It is an amenable number.

31004240 is an abundant number, since it is smaller than the sum of its proper divisors (41312560).

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

31004240 is a wasteful number, since it uses less digits than its factorization.

31004240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259 (or 1253 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 31004240 is about 5568.1451130516. The cubic root of 31004240 is about 314.1523865797.

Adding to 31004240 its reverse (4240013), we get a palindrome (35244253).

The spelling of 31004240 in words is "thirty-one million, four thousand, two hundred forty".