42556406 has 32 divisors (see below), whose sum is σ = 69906240. Its totient is φ = 19420800.

The previous prime is 42556391. The next prime is 42556411. The reversal of 42556406 is 60465524.

It is a super-2 number, since 2×42556406² = 3622095383273672, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

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, 599351 + ... + 599421.

It is an arithmetic number, because the mean of its divisors is an integer number (2184570).

Almost surely, 2^42556406 is an apocalyptic number.

42556406 is a deficient number, since it is larger than the sum of its proper divisors (27349834).

42556406 is an equidigital number, since it uses as much as digits as its factorization.

42556406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

The square root of 42556406 is about 6523.5271134563. The cubic root of 42556406 is about 349.1309213437.

The spelling of 42556406 in words is "forty-two million, five hundred fifty-six thousand, four hundred six".