40555 has 4 divisors (see below), whose sum is σ = 48672. Its totient is φ = 32440.

The previous prime is 40543. The next prime is 40559. The reversal of 40555 is 55504.

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 40555 - 2⁷ = 40427 is a prime.

It is a Duffinian number.

40555 is a modest number, since divided by 555 gives 40 as remainder.

40555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (40559) 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, 4051 + ... + 4060.

It is an arithmetic number, because the mean of its divisors is an integer number (12168).

2⁴⁰⁵⁵⁵ is an apocalyptic number.

40555 is a deficient number, since it is larger than the sum of its proper divisors (8117).

40555 is an equidigital number, since it uses as much as digits as its factorization.

40555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8116.

The product of its (nonzero) digits is 500, while the sum is 19.

The square root of 40555 is about 201.3827202120. The cubic root of 40555 is about 34.3569657469.

It can be divided in two parts, 40 and 555, that added together give a palindrome (595).

The spelling of 40555 in words is "forty thousand, five hundred fifty-five".