16131240 has 48 divisors (see below), whose sum is σ = 52427700. Its totient is φ = 4301568.

The previous prime is 16131233. The next prime is 16131307. The reversal of 16131240 is 4213161.

It is a happy number.

16131240 is a `hidden beast` number, since 1 + 613 + 12 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16112196 + 19044 = 4014^2 + 138^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22045 + ... + 22764.

Almost surely, 2^16131240 is an apocalyptic number.

16131240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16131240 is an abundant number, since it is smaller than the sum of its proper divisors (36296460).

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

16131240 is a wasteful number, since it uses less digits than its factorization.

16131240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44826 (or 44819 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 16131240 is about 4016.3714967617. The cubic root of 16131240 is about 252.6713015938.

The spelling of 16131240 in words is "sixteen million, one hundred thirty-one thousand, two hundred forty".