400401599279 has 4 divisors (see below), whose sum is σ = 436801744680. Its totient is φ = 364001453880.

The previous prime is 400401599243. The next prime is 400401599287. The reversal of 400401599279 is 972995104004.

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

It is a cyclic number.

It is not a de Polignac number, because 400401599279 - 2³⁶ = 331682122543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400401599179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18200072684 + ... + 18200072705.

It is an arithmetic number, because the mean of its divisors is an integer number (109200436170).

Almost surely, 2^400401599279 is an apocalyptic number.

400401599279 is a deficient number, since it is larger than the sum of its proper divisors (36400145401).

400401599279 is a wasteful number, since it uses less digits than its factorization.

400401599279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36400145400.

The product of its (nonzero) digits is 816480, while the sum is 50.

The spelling of 400401599279 in words is "four hundred billion, four hundred one million, five hundred ninety-nine thousand, two hundred seventy-nine".