400439293679 has 4 divisors (see below), whose sum is σ = 417849697776. Its totient is φ = 383028889584.

The previous prime is 400439293669. The next prime is 400439293693. The reversal of 400439293679 is 976392934004.

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 400439293679 - 2¹⁶ = 400439228143 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 (400439293669) 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, 8705202014 + ... + 8705202059.

It is an arithmetic number, because the mean of its divisors is an integer number (104462424444).

Almost surely, 2^400439293679 is an apocalyptic number.

400439293679 is a deficient number, since it is larger than the sum of its proper divisors (17410404097).

400439293679 is a wasteful number, since it uses less digits than its factorization.

400439293679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17410404096.

The product of its (nonzero) digits is 8817984, while the sum is 56.

The spelling of 400439293679 in words is "four hundred billion, four hundred thirty-nine million, two hundred ninety-three thousand, six hundred seventy-nine".