398209223 has 4 divisors (see below), whose sum is σ = 398255088. Its totient is φ = 398163360.

The previous prime is 398209211. The next prime is 398209243. The reversal of 398209223 is 322902893.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 398209223 - 2¹⁸ = 397947079 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 (398209243) 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, 5483 + ... + 28748.

It is an arithmetic number, because the mean of its divisors is an integer number (99563772).

Almost surely, 2^398209223 is an apocalyptic number.

398209223 is a deficient number, since it is larger than the sum of its proper divisors (45865).

398209223 is a wasteful number, since it uses less digits than its factorization.

398209223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45864.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 398209223 is about 19955.1803549855. The cubic root of 398209223 is about 735.7051082867.

The spelling of 398209223 in words is "three hundred ninety-eight million, two hundred nine thousand, two hundred twenty-three".