42431689 has 4 divisors (see below), whose sum is σ = 42468624. Its totient is φ = 42394756.

The previous prime is 42431663. The next prime is 42431713. The reversal of 42431689 is 98613424.

42431689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42431689 - 2¹⁵ = 42398921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42431789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16687 + ... + 19060.

It is an arithmetic number, because the mean of its divisors is an integer number (10617156).

Almost surely, 2^42431689 is an apocalyptic number.

It is an amenable number.

42431689 is a deficient number, since it is larger than the sum of its proper divisors (36935).

42431689 is a wasteful number, since it uses less digits than its factorization.

42431689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36934.

The product of its digits is 41472, while the sum is 37.

The square root of 42431689 is about 6513.9610837032. The cubic root of 42431689 is about 348.7895299976.

The spelling of 42431689 in words is "forty-two million, four hundred thirty-one thousand, six hundred eighty-nine".