42189955 has 4 divisors (see below), whose sum is σ = 50627952. Its totient is φ = 33751960.

The previous prime is 42189947. The next prime is 42189989. The reversal of 42189955 is 55998124.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42189955 - 2³ = 42189947 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4218991 + ... + 4219000.

It is an arithmetic number, because the mean of its divisors is an integer number (12656988).

Almost surely, 2^42189955 is an apocalyptic number.

42189955 is a deficient number, since it is larger than the sum of its proper divisors (8437997).

42189955 is an equidigital number, since it uses as much as digits as its factorization.

42189955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8437996.

The product of its digits is 129600, while the sum is 43.

The square root of 42189955 is about 6495.3795116221. The cubic root of 42189955 is about 348.1259150422.

The spelling of 42189955 in words is "forty-two million, one hundred eighty-nine thousand, nine hundred fifty-five".