31134840 has 128 divisors (see below), whose sum is σ = 103334400. Its totient is φ = 7441920.

The previous prime is 31134839. The next prime is 31134889. The reversal of 31134840 is 4843113.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31134840.

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 31 ways as a sum of consecutive naturals, for example, 135846 + ... + 136074.

It is an arithmetic number, because the mean of its divisors is an integer number (807300).

Almost surely, 2^31134840 is an apocalyptic number.

31134840 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 31134840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51667200).

31134840 is an abundant number, since it is smaller than the sum of its proper divisors (72199560).

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

31134840 is a wasteful number, since it uses less digits than its factorization.

31134840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 31134840 is about 5579.8602133028. The cubic root of 31134840 is about 314.5928728693.

Adding to 31134840 its reverse (4843113), we get a palindrome (35977953).

The spelling of 31134840 in words is "thirty-one million, one hundred thirty-four thousand, eight hundred forty".