400071439991 has 8 divisors (see below), whose sum is σ = 404582966640. Its totient is φ = 395560276672.

The previous prime is 400071439981. The next prime is 400071440009. The reversal of 400071439991 is 199934170004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 400071439991 - 2¹⁰ = 400071438967 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 (400071439981) 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 7 ways as a sum of consecutive naturals, for example, 2555996 + ... + 2707998.

It is an arithmetic number, because the mean of its divisors is an integer number (50572870830).

Almost surely, 2^400071439991 is an apocalyptic number.

400071439991 is a deficient number, since it is larger than the sum of its proper divisors (4511526649).

400071439991 is a wasteful number, since it uses less digits than its factorization.

400071439991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181665.

The product of its (nonzero) digits is 244944, while the sum is 47.

The spelling of 400071439991 in words is "four hundred billion, seventy-one million, four hundred thirty-nine thousand, nine hundred ninety-one".