4000055 has 4 divisors (see below), whose sum is σ = 4800072. Its totient is φ = 3200040.

The previous prime is 4000043. The next prime is 4000063. The reversal of 4000055 is 5500004.

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

It is not a de Polignac number, because 4000055 - 2⁴ = 4000039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400001 + ... + 400010.

It is an arithmetic number, because the mean of its divisors is an integer number (1200018).

Almost surely, 2^4000055 is an apocalyptic number.

4000055 is a deficient number, since it is larger than the sum of its proper divisors (800017).

4000055 is an equidigital number, since it uses as much as digits as its factorization.

4000055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800016.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 4000055 is about 2000.0137499527. The cubic root of 4000055 is about 158.7408327523.

Adding to 4000055 its reverse (5500004), we get a palindrome (9500059).

The spelling of 4000055 in words is "four million, fifty-five", and thus it is an aban number.