42556823 has 2 divisors, whose sum is σ = 42556824. Its totient is φ = 42556822.

The previous prime is 42556781. The next prime is 42556841. The reversal of 42556823 is 32865524.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42556823 - 2⁸ = 42556567 is a prime.

It is a super-2 number, since 2×42556823² = 3622166367706658, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42556853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21278411 + 21278412.

It is an arithmetic number, because the mean of its divisors is an integer number (21278412).

Almost surely, 2^42556823 is an apocalyptic number.

42556823 is a deficient number, since it is larger than the sum of its proper divisors (1).

42556823 is an equidigital number, since it uses as much as digits as its factorization.

42556823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 35.

The square root of 42556823 is about 6523.5590746156. The cubic root of 42556823 is about 349.1320616900.

The spelling of 42556823 in words is "forty-two million, five hundred fifty-six thousand, eight hundred twenty-three".