131228400 has 60 divisors (see below), whose sum is σ = 420372152. Its totient is φ = 34993920.

The previous prime is 131228399. The next prime is 131228407. The reversal of 131228400 is 4822131.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131228407) 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, 53479 + ... + 55878.

Almost surely, 2^131228400 is an apocalyptic number.

131228400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131228400 is an abundant number, since it is smaller than the sum of its proper divisors (289143752).

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

131228400 is a wasteful number, since it uses less digits than its factorization.

131228400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109378 (or 109367 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 131228400 is about 11455.4964973152. The cubic root of 131228400 is about 508.1702985779.

The spelling of 131228400 in words is "one hundred thirty-one million, two hundred twenty-eight thousand, four hundred".