398505893 has 4 divisors (see below), whose sum is σ = 398664300. Its totient is φ = 398347488.

The previous prime is 398505871. The next prime is 398505917.

398505893 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 232044289 + 166461604 = 15233^2 + 12902^2 .

It is a cyclic number.

It is not a de Polignac number, because 398505893 - 2⁸ = 398505637 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 (398502893) 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, 75368 + ... + 80481.

It is an arithmetic number, because the mean of its divisors is an integer number (99666075).

Almost surely, 2^398505893 is an apocalyptic number.

It is an amenable number.

398505893 is a deficient number, since it is larger than the sum of its proper divisors (158407).

398505893 is a wasteful number, since it uses less digits than its factorization.

398505893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158406.

The product of its (nonzero) digits is 1166400, while the sum is 50.

The square root of 398505893 is about 19962.6123791452. The cubic root of 398505893 is about 735.8877655784.

The spelling of 398505893 in words is "three hundred ninety-eight million, five hundred five thousand, eight hundred ninety-three".