398829805 has 16 divisors (see below), whose sum is σ = 523341504. Its totient is φ = 289370880.

The previous prime is 398829751. The next prime is 398829833. The reversal of 398829805 is 508928893.

It is a happy number.

It is not a de Polignac number, because 398829805 - 2¹¹ = 398827757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15442 + ... + 32188.

It is an arithmetic number, because the mean of its divisors is an integer number (32708844).

Almost surely, 2^398829805 is an apocalyptic number.

It is an amenable number.

398829805 is a deficient number, since it is larger than the sum of its proper divisors (124511699).

398829805 is a wasteful number, since it uses less digits than its factorization.

398829805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17196.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The square root of 398829805 is about 19970.7236974527. The cubic root of 398829805 is about 736.0870920538.

The spelling of 398829805 in words is "three hundred ninety-eight million, eight hundred twenty-nine thousand, eight hundred five".