131396220 has 36 divisors (see below), whose sum is σ = 398569080. Its totient is φ = 35038944.

The previous prime is 131396207. The next prime is 131396227. The reversal of 131396220 is 22693131.

131396220 is a `hidden beast` number, since 1 + 3 + 1 + 39 + 622 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131396227) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 364810 + ... + 365169.

Almost surely, 2^131396220 is an apocalyptic number.

131396220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131396220 is an abundant number, since it is smaller than the sum of its proper divisors (267172860).

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

131396220 is a wasteful number, since it uses less digits than its factorization.

131396220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729994 (or 729989 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 131396220 is about 11462.8190250043. The cubic root of 131396220 is about 508.3868289725.

The spelling of 131396220 in words is "one hundred thirty-one million, three hundred ninety-six thousand, two hundred twenty".