42556405 has 8 divisors (see below), whose sum is σ = 51933600. Its totient is φ = 33467856.

The previous prime is 42556391. The next prime is 42556411. The reversal of 42556405 is 50465524.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42556405 - 2⁷ = 42556277 is a prime.

It is a super-2 number, since 2×42556405² = 3622095213048050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71835 + ... + 72424.

It is an arithmetic number, because the mean of its divisors is an integer number (6491700).

Almost surely, 2^42556405 is an apocalyptic number.

It is an amenable number.

42556405 is a deficient number, since it is larger than the sum of its proper divisors (9377195).

42556405 is a wasteful number, since it uses less digits than its factorization.

42556405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144323.

The product of its (nonzero) digits is 24000, while the sum is 31.

The square root of 42556405 is about 6523.5270368107. The cubic root of 42556405 is about 349.1309186091.

The spelling of 42556405 in words is "forty-two million, five hundred fifty-six thousand, four hundred five".