400550155 has 4 divisors (see below), whose sum is σ = 480660192. Its totient is φ = 320440120.

The previous prime is 400550119. The next prime is 400550201. The reversal of 400550155 is 551055004.

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

It is not a de Polignac number, because 400550155 - 2¹³ = 400541963 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40055011 + ... + 40055020.

It is an arithmetic number, because the mean of its divisors is an integer number (120165048).

Almost surely, 2^400550155 is an apocalyptic number.

400550155 is a deficient number, since it is larger than the sum of its proper divisors (80110037).

400550155 is an equidigital number, since it uses as much as digits as its factorization.

400550155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80110036.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 400550155 is about 20013.7491490225. The cubic root of 400550155 is about 737.1439430368.

The spelling of 400550155 in words is "four hundred million, five hundred fifty thousand, one hundred fifty-five".