131866440 has 64 divisors (see below), whose sum is σ = 396446400. Its totient is φ = 35089152.

The previous prime is 131866439. The next prime is 131866447. The reversal of 131866440 is 44668131.

It is a super-3 number, since 3×131866440³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (131866447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76306 + ... + 78014.

It is an arithmetic number, because the mean of its divisors is an integer number (6194475).

Almost surely, 2^131866440 is an apocalyptic number.

131866440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131866440 is an abundant number, since it is smaller than the sum of its proper divisors (264579960).

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

131866440 is a wasteful number, since it uses less digits than its factorization.

131866440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2366 (or 2362 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 131866440 is about 11483.3113691130. The cubic root of 131866440 is about 508.9925517699.

The spelling of 131866440 in words is "one hundred thirty-one million, eight hundred sixty-six thousand, four hundred forty".