131818240 has 36 divisors (see below), whose sum is σ = 315748944. Its totient is φ = 52726784.

The previous prime is 131818237. The next prime is 131818243. The reversal of 131818240 is 42818131.

It is an interprime number because it is at equal distance from previous prime (131818237) and next prime (131818243).

It is a junction number, because it is equal to n+sod(n) for n = 131818199 and 131818208.

It is not an unprimeable number, because it can be changed into a prime (131818243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50212 + ... + 52771.

It is an arithmetic number, because the mean of its divisors is an integer number (8770804).

Almost surely, 2^131818240 is an apocalyptic number.

131818240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131818240 is an abundant number, since it is smaller than the sum of its proper divisors (183930704).

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

131818240 is an equidigital number, since it uses as much as digits as its factorization.

131818240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103004 (or 102990 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 131818240 is about 11481.2124795250. The cubic root of 131818240 is about 508.9305283297.

The spelling of 131818240 in words is "one hundred thirty-one million, eight hundred eighteen thousand, two hundred forty".