42745881 has 4 divisors (see below), whose sum is σ = 56994512. Its totient is φ = 28497252.

The previous prime is 42745853. The next prime is 42745883. The reversal of 42745881 is 18854724.

It is a happy number.

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 not a de Polignac number, because 42745881 - 2¹³ = 42737689 is a prime.

It is a super-2 number, since 2×42745881² = 3654420684932322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42745883) 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, 7124311 + ... + 7124316.

It is an arithmetic number, because the mean of its divisors is an integer number (14248628).

Almost surely, 2^42745881 is an apocalyptic number.

It is an amenable number.

42745881 is a deficient number, since it is larger than the sum of its proper divisors (14248631).

42745881 is a wasteful number, since it uses less digits than its factorization.

42745881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14248630.

The product of its digits is 71680, while the sum is 39.

The square root of 42745881 is about 6538.0334199207. The cubic root of 42745881 is about 349.6483024974.

The spelling of 42745881 in words is "forty-two million, seven hundred forty-five thousand, eight hundred eighty-one".