42189387 has 8 divisors (see below), whose sum is σ = 56379600. Its totient is φ = 28062720.

The previous prime is 42189379. The next prime is 42189391. The reversal of 42189387 is 78398124.

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

It is not a de Polignac number, because 42189387 - 2³ = 42189379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42189347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14314 + ... + 17007.

It is an arithmetic number, because the mean of its divisors is an integer number (7047450).

Almost surely, 2^42189387 is an apocalyptic number.

42189387 is a deficient number, since it is larger than the sum of its proper divisors (14190213).

42189387 is a wasteful number, since it uses less digits than its factorization.

42189387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31773.

The product of its digits is 96768, while the sum is 42.

The square root of 42189387 is about 6495.3357880867. The cubic root of 42189387 is about 348.1243527714.

The spelling of 42189387 in words is "forty-two million, one hundred eighty-nine thousand, three hundred eighty-seven".