399246837991 has 8 divisors (see below), whose sum is σ = 411350665424. Its totient is φ = 387322326720.

The previous prime is 399246837959. The next prime is 399246838007. The reversal of 399246837991 is 199738642993.

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 399246837991 - 2⁵ = 399246837959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399246837991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399246837091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44824521 + ... + 44833426.

It is an arithmetic number, because the mean of its divisors is an integer number (51418833178).

Almost surely, 2^399246837991 is an apocalyptic number.

399246837991 is a deficient number, since it is larger than the sum of its proper divisors (12103827433).

399246837991 is an equidigital number, since it uses as much as digits as its factorization.

399246837991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89658081.

The product of its digits is 158723712, while the sum is 70.

The spelling of 399246837991 in words is "three hundred ninety-nine billion, two hundred forty-six million, eight hundred thirty-seven thousand, nine hundred ninety-one".