42421689 has 12 divisors (see below), whose sum is σ = 61908756. Its totient is φ = 27988992.

The previous prime is 42421667. The next prime is 42421703. The reversal of 42421689 is 98612424.

It can be written as a sum of positive squares in 2 ways, for example, as 22467600 + 19954089 = 4740^2 + 4467^2 .

It is not a de Polignac number, because 42421689 - 2¹⁵ = 42388921 is a prime.

It is a super-2 number, since 2×42421689² = 3599199395225442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42421619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23424 + ... + 25169.

It is an arithmetic number, because the mean of its divisors is an integer number (5159063).

Almost surely, 2^42421689 is an apocalyptic number.

It is an amenable number.

42421689 is a deficient number, since it is larger than the sum of its proper divisors (19487067).

42421689 is a wasteful number, since it uses less digits than its factorization.

42421689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48696 (or 48693 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 42421689 is about 6513.1934563622. The cubic root of 42421689 is about 348.7621277626.

The spelling of 42421689 in words is "forty-two million, four hundred twenty-one thousand, six hundred eighty-nine".