42190994 has 4 divisors (see below), whose sum is σ = 63286494. Its totient is φ = 21095496.

The previous prime is 42190987. The next prime is 42190999. The reversal of 42190994 is 49909124.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 27175369 + 15015625 = 5213^2 + 3875^2 .

It is not an unprimeable number, because it can be changed into a prime (42190999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10547747 + ... + 10547750.

Almost surely, 2^42190994 is an apocalyptic number.

42190994 is a deficient number, since it is larger than the sum of its proper divisors (21095500).

42190994 is a wasteful number, since it uses less digits than its factorization.

42190994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21095499.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 42190994 is about 6495.4594910599. The cubic root of 42190994 is about 348.1287727513.

The spelling of 42190994 in words is "forty-two million, one hundred ninety thousand, nine hundred ninety-four".