398834438893 has 4 divisors (see below), whose sum is σ = 435092115168. Its totient is φ = 362576762620.

The previous prime is 398834438869. The next prime is 398834438909.

398834438893 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398834438893 - 2⁵ = 398834438861 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 (398834438803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18128838121 + ... + 18128838142.

It is an arithmetic number, because the mean of its divisors is an integer number (108773028792).

Almost surely, 2^398834438893 is an apocalyptic number.

It is an amenable number.

398834438893 is a deficient number, since it is larger than the sum of its proper divisors (36257676275).

398834438893 is a wasteful number, since it uses less digits than its factorization.

398834438893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36257676274.

The product of its digits is 429981696, while the sum is 70.

The spelling of 398834438893 in words is "three hundred ninety-eight billion, eight hundred thirty-four million, four hundred thirty-eight thousand, eight hundred ninety-three".