42345881 has 4 divisors (see below), whose sum is σ = 42669264. Its totient is φ = 42022500.

The previous prime is 42345847. The next prime is 42345911. The reversal of 42345881 is 18854324.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42345881 - 2¹⁸ = 42083737 is a prime.

It is a super-2 number, since 2×42345881² = 3586347275332322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42348881) 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 3 ways as a sum of consecutive naturals, for example, 161495 + ... + 161756.

It is an arithmetic number, because the mean of its divisors is an integer number (10667316).

Almost surely, 2^42345881 is an apocalyptic number.

It is an amenable number.

42345881 is a deficient number, since it is larger than the sum of its proper divisors (323383).

42345881 is a wasteful number, since it uses less digits than its factorization.

42345881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323382.

The product of its digits is 30720, while the sum is 35.

The square root of 42345881 is about 6507.3712818618. The cubic root of 42345881 is about 348.5542567061.

The spelling of 42345881 in words is "forty-two million, three hundred forty-five thousand, eight hundred eighty-one".