131304840 has 128 divisors (see below), whose sum is σ = 415825920. Its totient is φ = 33120000.

The previous prime is 131304799. The next prime is 131304847. The reversal of 131304840 is 48403131.

It is a super-2 number, since 2×131304840² = 34481922014851200, which contains 22 as substring.

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 131304840.

It is not an unprimeable number, because it can be changed into a prime (131304847) 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, 174465 + ... + 175215.

It is an arithmetic number, because the mean of its divisors is an integer number (3248640).

Almost surely, 2^131304840 is an apocalyptic number.

131304840 is a gapful number since it is divisible by the number (10) 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 131304840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207912960).

131304840 is an abundant number, since it is smaller than the sum of its proper divisors (284521080).

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

131304840 is a wasteful number, since it uses less digits than its factorization.

131304840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 839 counting only the distinct ones).

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

The square root of 131304840 is about 11458.8324012528. The cubic root of 131304840 is about 508.2689484581.

Adding to 131304840 its reverse (48403131), we get a palindrome (179707971).

The spelling of 131304840 in words is "one hundred thirty-one million, three hundred four thousand, eight hundred forty".