400278044323 has 4 divisors (see below), whose sum is σ = 406252343560. Its totient is φ = 394303745088.

The previous prime is 400278044317. The next prime is 400278044381. The reversal of 400278044323 is 323440872004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400278044323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400278044123) 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, 2987149518 + ... + 2987149651.

It is an arithmetic number, because the mean of its divisors is an integer number (101563085890).

Almost surely, 2^400278044323 is an apocalyptic number.

400278044323 is a deficient number, since it is larger than the sum of its proper divisors (5974299237).

400278044323 is an equidigital number, since it uses as much as digits as its factorization.

400278044323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5974299236.

The product of its (nonzero) digits is 129024, while the sum is 37.

The spelling of 400278044323 in words is "four hundred billion, two hundred seventy-eight million, forty-four thousand, three hundred twenty-three".