131599440 has 120 divisors (see below), whose sum is σ = 505110528. Its totient is φ = 30078720.

The previous prime is 131599439. The next prime is 131599451. The reversal of 131599440 is 44995131.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 131599395 and 131599404.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 8016 + ... + 18095.

Almost surely, 2^131599440 is an apocalyptic number.

131599440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131599440 is an abundant number, since it is smaller than the sum of its proper divisors (373511088).

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

131599440 is a wasteful number, since it uses less digits than its factorization.

131599440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26137 (or 26128 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 131599440 is about 11471.6799118525. The cubic root of 131599440 is about 508.6487876864.

The spelling of 131599440 in words is "one hundred thirty-one million, five hundred ninety-nine thousand, four hundred forty".