42945891 has 16 divisors (see below), whose sum is σ = 58761120. Its totient is φ = 27889920.

The previous prime is 42945883. The next prime is 42945913. The reversal of 42945891 is 19854924.

It is not a de Polignac number, because 42945891 - 2³ = 42945883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42945811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18871 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (3672570).

Almost surely, 2^42945891 is an apocalyptic number.

42945891 is a deficient number, since it is larger than the sum of its proper divisors (15815229).

42945891 is a wasteful number, since it uses less digits than its factorization.

42945891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2326.

The product of its digits is 103680, while the sum is 42.

The square root of 42945891 is about 6553.3114529984. The cubic root of 42945891 is about 350.1927944616.

The spelling of 42945891 in words is "forty-two million, nine hundred forty-five thousand, eight hundred ninety-one".