131440240 has 20 divisors (see below), whose sum is σ = 305598744. Its totient is φ = 52576064.

The previous prime is 131440213. The next prime is 131440249. The reversal of 131440240 is 42044131.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131440249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 821422 + ... + 821581.

Almost surely, 2^131440240 is an apocalyptic number.

131440240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131440240 is an abundant number, since it is smaller than the sum of its proper divisors (174158504).

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

131440240 is a wasteful number, since it uses less digits than its factorization.

131440240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643016 (or 1643010 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 131440240 is about 11464.7389852539. The cubic root of 131440240 is about 508.4435954191.

Adding to 131440240 its reverse (42044131), we get a palindrome (173484371).

The spelling of 131440240 in words is "one hundred thirty-one million, four hundred forty thousand, two hundred forty".