42405891 has 32 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 23813280.

The previous prime is 42405889. The next prime is 42405893. The reversal of 42405891 is 19850424.

It is an interprime number because it is at equal distance from previous prime (42405889) and next prime (42405893).

It is not a de Polignac number, because 42405891 - 2¹ = 42405889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (42405893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28750 + ... + 30188.

It is an arithmetic number, because the mean of its divisors is an integer number (2073600).

Almost surely, 2^42405891 is an apocalyptic number.

42405891 is a deficient number, since it is larger than the sum of its proper divisors (23949309).

42405891 is a wasteful number, since it uses less digits than its factorization.

42405891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1519.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 42405891 is about 6511.9805742954. The cubic root of 42405891 is about 348.7188289351.

The spelling of 42405891 in words is "forty-two million, four hundred five thousand, eight hundred ninety-one".