42557405 has 16 divisors (see below), whose sum is σ = 55871424. Its totient is φ = 30862080.

The previous prime is 42557399. The next prime is 42557407. The reversal of 42557405 is 50475524.

It is not a de Polignac number, because 42557405 - 2⁸ = 42557149 is a prime.

It is a super-2 number, since 2×42557405² = 3622265440668050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42557407) 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, 22922 + ... + 24708.

It is an arithmetic number, because the mean of its divisors is an integer number (3491964).

Almost surely, 2^42557405 is an apocalyptic number.

It is an amenable number.

42557405 is a deficient number, since it is larger than the sum of its proper divisors (13314019).

42557405 is a wasteful number, since it uses less digits than its factorization.

42557405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2236.

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 42557405 is about 6523.6036820150. The cubic root of 42557405 is about 349.1336532400.

The spelling of 42557405 in words is "forty-two million, five hundred fifty-seven thousand, four hundred five".