31004040 has 64 divisors (see below), whose sum is σ = 94089600. Its totient is φ = 8172032.

The previous prime is 31004027. The next prime is 31004041. The reversal of 31004040 is 4040013.

It is a super-2 number, since 2×31004040² = 1922500992643200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (31004041) 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 15 ways as a sum of consecutive naturals, for example, 9229 + ... + 12131.

It is an arithmetic number, because the mean of its divisors is an integer number (1470150).

Almost surely, 2^31004040 is an apocalyptic number.

31004040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31004040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47044800).

31004040 is an abundant number, since it is smaller than the sum of its proper divisors (63085560).

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

31004040 is a wasteful number, since it uses less digits than its factorization.

31004040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3006 (or 3002 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 31004040 is about 5568.1271537205. The cubic root of 31004040 is about 314.1517110741.

Adding to 31004040 its reverse (4040013), we get a palindrome (35044053).

It can be divided in two parts, 3100 and 4040, that added together give a triangular number (7140 = T₁₁₉).

The spelling of 31004040 in words is "thirty-one million, four thousand, forty".