397891739899 has 8 divisors (see below), whose sum is σ = 418952569040. Its totient is φ = 376842826656.

The previous prime is 397891739887. The next prime is 397891739909. The reversal of 397891739899 is 998937198793.

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 397891739899 - 2¹¹ = 397891737851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397891739879) 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, 2910384 + ... + 3044029.

It is an arithmetic number, because the mean of its divisors is an integer number (52369071130).

Almost surely, 2^397891739899 is an apocalyptic number.

397891739899 is a deficient number, since it is larger than the sum of its proper divisors (21060829141).

397891739899 is a wasteful number, since it uses less digits than its factorization.

397891739899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5957949.

The product of its digits is 1666598976, while the sum is 82.

The spelling of 397891739899 in words is "three hundred ninety-seven billion, eight hundred ninety-one million, seven hundred thirty-nine thousand, eight hundred ninety-nine".