400055801 has 4 divisors (see below), whose sum is σ = 404550900. Its totient is φ = 395560704.

The previous prime is 400055749. The next prime is 400055807. The reversal of 400055801 is 108550004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 170563600 + 229492201 = 13060^2 + 15149^2 .

It is a cyclic number.

It is not a de Polignac number, because 400055801 - 2¹⁰ = 400054777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400055807) by changing a digit.

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, 2247416 + ... + 2247593.

It is an arithmetic number, because the mean of its divisors is an integer number (101137725).

Almost surely, 2^400055801 is an apocalyptic number.

It is an amenable number.

400055801 is a deficient number, since it is larger than the sum of its proper divisors (4495099).

400055801 is an equidigital number, since it uses as much as digits as its factorization.

400055801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4495098.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 400055801 is about 20001.3949763510. The cubic root of 400055801 is about 736.8405602419.

The spelling of 400055801 in words is "four hundred million, fifty-five thousand, eight hundred one".