398860923 has 4 divisors (see below), whose sum is σ = 531814568. Its totient is φ = 265907280.

The previous prime is 398860909. The next prime is 398860933. The reversal of 398860923 is 329068893.

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

It is not a de Polignac number, because 398860923 - 2⁸ = 398860667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398860933) 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, 66476818 + ... + 66476823.

It is an arithmetic number, because the mean of its divisors is an integer number (132953642).

Almost surely, 2^398860923 is an apocalyptic number.

398860923 is a deficient number, since it is larger than the sum of its proper divisors (132953645).

398860923 is a wasteful number, since it uses less digits than its factorization.

398860923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132953644.

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 398860923 is about 19971.5027727009. The cubic root of 398860923 is about 736.1062355265.

The spelling of 398860923 in words is "three hundred ninety-eight million, eight hundred sixty thousand, nine hundred twenty-three".