42187689 has 16 divisors (see below), whose sum is σ = 63435840. Its totient is φ = 27704160.

The previous prime is 42187669. The next prime is 42187697. The reversal of 42187689 is 98678124.

It is not a de Polignac number, because 42187689 - 2⁸ = 42187433 is a prime.

It is a super-2 number, since 2×42187689² = 3559602206321442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42187669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9852 + ... + 13469.

It is an arithmetic number, because the mean of its divisors is an integer number (3964740).

Almost surely, 2^42187689 is an apocalyptic number.

It is an amenable number.

42187689 is a deficient number, since it is larger than the sum of its proper divisors (21248151).

42187689 is a wasteful number, since it uses less digits than its factorization.

42187689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23397 (or 23391 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 42187689 is about 6495.2050775938. The cubic root of 42187689 is about 348.1196823781.

The spelling of 42187689 in words is "forty-two million, one hundred eighty-seven thousand, six hundred eighty-nine".