42561385 has 16 divisors (see below), whose sum is σ = 54307584. Its totient is φ = 31949632.

The previous prime is 42561377. The next prime is 42561391. The reversal of 42561385 is 58316524.

It is a cyclic number.

It is not a de Polignac number, because 42561385 - 2³ = 42561377 is a prime.

It is a super-2 number, since 2×42561385² = 3622942986236450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42561385.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2604 + ... + 9586.

It is an arithmetic number, because the mean of its divisors is an integer number (3394224).

Almost surely, 2^42561385 is an apocalyptic number.

It is an amenable number.

42561385 is a deficient number, since it is larger than the sum of its proper divisors (11746199).

42561385 is a wasteful number, since it uses less digits than its factorization.

42561385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7064.

The product of its digits is 28800, while the sum is 34.

The square root of 42561385 is about 6523.9087210046. The cubic root of 42561385 is about 349.1445366466.

The spelling of 42561385 in words is "forty-two million, five hundred sixty-one thousand, three hundred eighty-five".