131005440 has 132 divisors (see below), whose sum is σ = 454090104. Its totient is φ = 34922496.

The previous prime is 131005439. The next prime is 131005471. The reversal of 131005440 is 44500131.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44659 + ... + 47501.

Almost surely, 2^131005440 is an apocalyptic number.

131005440 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 131005440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227045052).

131005440 is an abundant number, since it is smaller than the sum of its proper divisors (323084664).

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

131005440 is a wasteful number, since it uses less digits than its factorization.

131005440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2874 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 131005440 is about 11445.7607872959. The cubic root of 131005440 is about 507.8823378474.

Adding to 131005440 its reverse (44500131), we get a palindrome (175505571).

The spelling of 131005440 in words is "one hundred thirty-one million, five thousand, four hundred forty".