398443358879 has 4 divisors (see below), whose sum is σ = 398674610376. Its totient is φ = 398212107384.

The previous prime is 398443358867. The next prime is 398443358893. The reversal of 398443358879 is 978853344893.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978853344893 = 29 ⋅33753563617.

It is a cyclic number.

It is not a de Polignac number, because 398443358879 - 2⁸ = 398443358623 is a prime.

It is a super-2 number, since 2×398443358879² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398443348879) 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, 115623164 + ... + 115626609.

It is an arithmetic number, because the mean of its divisors is an integer number (99668652594).

Almost surely, 2^398443358879 is an apocalyptic number.

398443358879 is a deficient number, since it is larger than the sum of its proper divisors (231251497).

398443358879 is a wasteful number, since it uses less digits than its factorization.

398443358879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231251496.

The product of its digits is 627056640, while the sum is 71.

The spelling of 398443358879 in words is "three hundred ninety-eight billion, four hundred forty-three million, three hundred fifty-eight thousand, eight hundred seventy-nine".