31104840 has 128 divisors (see below), whose sum is σ = 101928960. Its totient is φ = 7547904.

The previous prime is 31104833. The next prime is 31104847. The reversal of 31104840 is 4840113.

It is an interprime number because it is at equal distance from previous prime (31104833) and next prime (31104847).

It is a super-2 number, since 2×31104840² = 1935022142851200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31104847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 198042 + ... + 198198.

It is an arithmetic number, because the mean of its divisors is an integer number (796320).

Almost surely, 2^31104840 is an apocalyptic number.

31104840 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 31104840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50964480).

31104840 is an abundant number, since it is smaller than the sum of its proper divisors (70824120).

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

31104840 is a wasteful number, since it uses less digits than its factorization.

31104840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 31104840 is about 5577.1713260398. The cubic root of 31104840 is about 314.4917983274.

Adding to 31104840 its reverse (4840113), we get a palindrome (35944953).

The spelling of 31104840 in words is "thirty-one million, one hundred four thousand, eight hundred forty".