400278044321 has 4 divisors (see below), whose sum is σ = 423823811652. Its totient is φ = 376732276992.

The previous prime is 400278044317. The next prime is 400278044381. The reversal of 400278044321 is 123440872004.

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 330982746721 + 69295297600 = 575311^2 + 263240^2 .

It is not a de Polignac number, because 400278044321 - 2² = 400278044317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400278044311) 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, 11772883640 + ... + 11772883673.

It is an arithmetic number, because the mean of its divisors is an integer number (105955952913).

Almost surely, 2^400278044321 is an apocalyptic number.

It is an amenable number.

400278044321 is a deficient number, since it is larger than the sum of its proper divisors (23545767331).

400278044321 is a wasteful number, since it uses less digits than its factorization.

400278044321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23545767330.

The product of its (nonzero) digits is 43008, while the sum is 35.

The spelling of 400278044321 in words is "four hundred billion, two hundred seventy-eight million, forty-four thousand, three hundred twenty-one".