131787840 has 56 divisors (see below), whose sum is σ = 418429440. Its totient is φ = 35143168.

The previous prime is 131787833. The next prime is 131787847. The reversal of 131787840 is 48787131.

It is an interprime number because it is at equal distance from previous prime (131787833) and next prime (131787847).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (131787847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67680 + ... + 69599.

Almost surely, 2^131787840 is an apocalyptic number.

131787840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131787840 is an abundant number, since it is smaller than the sum of its proper divisors (286641600).

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

131787840 is a wasteful number, since it uses less digits than its factorization.

131787840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137299 (or 137289 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 131787840 is about 11479.8885012007. Note that the first 3 decimals coincide. The cubic root of 131787840 is about 508.8914020359.

The spelling of 131787840 in words is "one hundred thirty-one million, seven hundred eighty-seven thousand, eight hundred forty".