400555555 has 4 divisors (see below), whose sum is σ = 480666672. Its totient is φ = 320444440.

The previous prime is 400555501. The next prime is 400555577. The reversal of 400555555 is 555555004.

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

It is not a de Polignac number, because 400555555 - 2¹⁷ = 400424483 is a prime.

It is a Duffinian number.

400555555 is a modest number, since divided by 55555 gives 4005 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 400555555.

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, 40055551 + ... + 40055560.

It is an arithmetic number, because the mean of its divisors is an integer number (120166668).

Almost surely, 2^400555555 is an apocalyptic number.

400555555 is a deficient number, since it is larger than the sum of its proper divisors (80111117).

400555555 is an equidigital number, since it uses as much as digits as its factorization.

400555555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80111116.

The product of its (nonzero) digits is 62500, while the sum is 34.

The square root of 400555555 is about 20013.8840558248. The cubic root of 400555555 is about 737.1472556135.

The spelling of 400555555 in words is "four hundred million, five hundred fifty-five thousand, five hundred fifty-five".