31004400 has 120 divisors (see below), whose sum is σ = 113536384. Its totient is φ = 7084800.

The previous prime is 31004387. The next prime is 31004423. The reversal of 31004400 is 440013.

It is a tau number, because it is divible by the number of its divisors (120).

It is a super-2 number, since 2×31004400² = 1922545638720000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6555 + ... + 10245.

Almost surely, 2^31004400 is an apocalyptic number.

31004400 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 31004400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56768192).

31004400 is an abundant number, since it is smaller than the sum of its proper divisors (82531984).

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

31004400 is a wasteful number, since it uses less digits than its factorization.

31004400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3719 (or 3708 counting only the distinct ones).

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

The square root of 31004400 is about 5568.1594804747. The cubic root of 31004400 is about 314.1529269821.

Adding to 31004400 its reverse (440013), we get a palindrome (31444413).

The spelling of 31004400 in words is "thirty-one million, four thousand, four hundred".