131278740 has 24 divisors (see below), whose sum is σ = 367580640. Its totient is φ = 35007648.

The previous prime is 131278729. The next prime is 131278781. The reversal of 131278740 is 47872131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1093930 + ... + 1094049.

It is an arithmetic number, because the mean of its divisors is an integer number (15315860).

Almost surely, 2^131278740 is an apocalyptic number.

131278740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131278740 is an abundant number, since it is smaller than the sum of its proper divisors (236301900).

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

131278740 is a wasteful number, since it uses less digits than its factorization.

131278740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187991 (or 2187989 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 131278740 is about 11457.6934851653. The cubic root of 131278740 is about 508.2352693273.

The spelling of 131278740 in words is "one hundred thirty-one million, two hundred seventy-eight thousand, seven hundred forty".