131398380 has 36 divisors (see below), whose sum is σ = 398575632. Its totient is φ = 35039520.

The previous prime is 131398373. The next prime is 131398381. The reversal of 131398380 is 83893131.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (131398381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364816 + ... + 365175.

Almost surely, 2^131398380 is an apocalyptic number.

131398380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131398380 is an abundant number, since it is smaller than the sum of its proper divisors (267177252).

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

131398380 is a wasteful number, since it uses less digits than its factorization.

131398380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730006 (or 730001 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 131398380 is about 11462.9132422783. The cubic root of 131398380 is about 508.3896147186.

The spelling of 131398380 in words is "one hundred thirty-one million, three hundred ninety-eight thousand, three hundred eighty".