400851361 has 4 divisors (see below), whose sum is σ = 401803924. Its totient is φ = 399898800.

The previous prime is 400851343. The next prime is 400851389. The reversal of 400851361 is 163158004.

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 130873600 + 269977761 = 11440^2 + 16431^2 .

It is a cyclic number.

It is not a de Polignac number, because 400851361 - 2⁵ = 400851329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400851961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 475650 + ... + 476491.

It is an arithmetic number, because the mean of its divisors is an integer number (100450981).

Almost surely, 2^400851361 is an apocalyptic number.

It is an amenable number.

400851361 is a deficient number, since it is larger than the sum of its proper divisors (952563).

400851361 is an equidigital number, since it uses as much as digits as its factorization.

400851361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952562.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 400851361 is about 20021.2727117933. The cubic root of 400851361 is about 737.3286694223.

The spelling of 400851361 in words is "four hundred million, eight hundred fifty-one thousand, three hundred sixty-one".