42194989 has 4 divisors (see below), whose sum is σ = 42669180. Its totient is φ = 41720800.

The previous prime is 42194983. The next prime is 42194993. The reversal of 42194989 is 98949124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16337764 + 25857225 = 4042^2 + 5085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42194989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42194983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236962 + ... + 237139.

It is an arithmetic number, because the mean of its divisors is an integer number (10667295).

Almost surely, 2^42194989 is an apocalyptic number.

It is an amenable number.

42194989 is a deficient number, since it is larger than the sum of its proper divisors (474191).

42194989 is an equidigital number, since it uses as much as digits as its factorization.

42194989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474190.

The product of its digits is 186624, while the sum is 46.

The square root of 42194989 is about 6495.7670062896. The cubic root of 42194989 is about 348.1397603296.

The spelling of 42194989 in words is "forty-two million, one hundred ninety-four thousand, nine hundred eighty-nine".