131422440 has 64 divisors (see below), whose sum is σ = 395640000. Its totient is φ = 34924032.

The previous prime is 131422381. The next prime is 131422453. The reversal of 131422440 is 44224131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35811 + ... + 39309.

It is an arithmetic number, because the mean of its divisors is an integer number (6181875).

Almost surely, 2^131422440 is an apocalyptic number.

131422440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131422440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197820000).

131422440 is an abundant number, since it is smaller than the sum of its proper divisors (264217560).

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

131422440 is a wasteful number, since it uses less digits than its factorization.

131422440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3826 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 131422440 is about 11463.9626656754. The cubic root of 131422440 is about 508.4206427714.

Adding to 131422440 its reverse (44224131), we get a palindrome (175646571).

The spelling of 131422440 in words is "one hundred thirty-one million, four hundred twenty-two thousand, four hundred forty".