42131389 has 8 divisors (see below), whose sum is σ = 44911800. Its totient is φ = 39384576.

The previous prime is 42131371. The next prime is 42131399. The reversal of 42131389 is 98313124.

It can be written as a sum of positive squares in 4 ways, for example, as 632025 + 41499364 = 795^2 + 6442^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42131389 - 2²⁵ = 8576957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42131389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5784 + ... + 10849.

It is an arithmetic number, because the mean of its divisors is an integer number (5613975).

Almost surely, 2^42131389 is an apocalyptic number.

It is an amenable number.

42131389 is a deficient number, since it is larger than the sum of its proper divisors (2780411).

42131389 is a wasteful number, since it uses less digits than its factorization.

42131389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16799.

The product of its digits is 5184, while the sum is 31.

The square root of 42131389 is about 6490.8696643824. The cubic root of 42131389 is about 347.9647567471.

The spelling of 42131389 in words is "forty-two million, one hundred thirty-one thousand, three hundred eighty-nine".