131439726 has 64 divisors (see below), whose sum is σ = 322790400. Its totient is φ = 39312000.

The previous prime is 131439709. The next prime is 131439731. The reversal of 131439726 is 627934131.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45526 + ... + 48326.

It is an arithmetic number, because the mean of its divisors is an integer number (5043600).

Almost surely, 2^131439726 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131439726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161395200).

131439726 is an abundant number, since it is smaller than the sum of its proper divisors (191350674).

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

131439726 is a wasteful number, since it uses less digits than its factorization.

131439726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2902 (or 2896 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 131439726 is about 11464.7165686728. The cubic root of 131439726 is about 508.4429326582.

The spelling of 131439726 in words is "one hundred thirty-one million, four hundred thirty-nine thousand, seven hundred twenty-six".