42000055 has 4 divisors (see below), whose sum is σ = 50400072. Its totient is φ = 33600040.

The previous prime is 42000037. The next prime is 42000059. The reversal of 42000055 is 55000024.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 42000055 - 2²¹ = 39902903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42000059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4200001 + ... + 4200010.

It is an arithmetic number, because the mean of its divisors is an integer number (12600018).

Almost surely, 2^42000055 is an apocalyptic number.

42000055 is a deficient number, since it is larger than the sum of its proper divisors (8400017).

42000055 is an equidigital number, since it uses as much as digits as its factorization.

42000055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8400016.

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 42000055 is about 6480.7449417486. The cubic root of 42000055 is about 347.6028162199.

Adding to 42000055 its reverse (55000024), we get a palindrome (97000079).

The spelling of 42000055 in words is "forty-two million, fifty-five", and thus it is an aban number and an uban number.