42442091 has 4 divisors (see below), whose sum is σ = 42456792. Its totient is φ = 42427392.

The previous prime is 42442073. The next prime is 42442097. The reversal of 42442091 is 19024424.

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

It is a cyclic number.

It is not a de Polignac number, because 42442091 - 2⁶ = 42442027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42442091.

It is not an unprimeable number, because it can be changed into a prime (42442097) 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, 1430 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (10614198).

Almost surely, 2^42442091 is an apocalyptic number.

42442091 is a deficient number, since it is larger than the sum of its proper divisors (14701).

42442091 is a wasteful number, since it uses less digits than its factorization.

42442091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14700.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 42442091 is about 6514.7594736874. The cubic root of 42442091 is about 348.8180292344.

The spelling of 42442091 in words is "forty-two million, four hundred forty-two thousand, ninety-one".