131398940 has 24 divisors (see below), whose sum is σ = 277597152. Its totient is φ = 52243520.

The previous prime is 131398907. The next prime is 131398991. The reversal of 131398940 is 49893131.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 131398894 and 131398903.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16331 + ... + 23010.

It is an arithmetic number, because the mean of its divisors is an integer number (11566548).

Almost surely, 2^131398940 is an apocalyptic number.

131398940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131398940 is an abundant number, since it is smaller than the sum of its proper divisors (146198212).

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

131398940 is a wasteful number, since it uses less digits than its factorization.

131398940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39517 (or 39515 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 131398940 is about 11462.9376688526. The cubic root of 131398940 is about 508.3903369441.

The spelling of 131398940 in words is "one hundred thirty-one million, three hundred ninety-eight thousand, nine hundred forty".