42042091 has 32 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 31135104.

The previous prime is 42042061. The next prime is 42042103. The reversal of 42042091 is 19024024.

It is not a de Polignac number, because 42042091 - 2⁵ = 42042059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42042061) 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 31 ways as a sum of consecutive naturals, for example, 110740 + ... + 111118.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^42042091 is an apocalyptic number.

42042091 is a deficient number, since it is larger than the sum of its proper divisors (13115669).

42042091 is a wasteful number, since it uses less digits than its factorization.

42042091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 42042091 is about 6483.9872763601. The cubic root of 42042091 is about 347.7187443214.

The spelling of 42042091 in words is "forty-two million, forty-two thousand, ninety-one".