398893812823 has 4 divisors (see below), whose sum is σ = 435156886728. Its totient is φ = 362630738920.

The previous prime is 398893812803. The next prime is 398893812917. The reversal of 398893812823 is 328218398893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398893812823 - 2⁹ = 398893812311 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 (398893812803) 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, 18131536936 + ... + 18131536957.

It is an arithmetic number, because the mean of its divisors is an integer number (108789221682).

Almost surely, 2^398893812823 is an apocalyptic number.

398893812823 is a deficient number, since it is larger than the sum of its proper divisors (36263073905).

398893812823 is a wasteful number, since it uses less digits than its factorization.

398893812823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36263073904.

The product of its digits is 35831808, while the sum is 64.

The spelling of 398893812823 in words is "three hundred ninety-eight billion, eight hundred ninety-three million, eight hundred twelve thousand, eight hundred twenty-three".