398229891 has 8 divisors (see below), whose sum is σ = 531066624. Its totient is φ = 265439880.

The previous prime is 398229883. The next prime is 398229901. The reversal of 398229891 is 198922893.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 398229891 - 2³ = 398229883 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (398229791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22506 + ... + 36096.

It is an arithmetic number, because the mean of its divisors is an integer number (66383328).

Almost surely, 2^398229891 is an apocalyptic number.

398229891 is a deficient number, since it is larger than the sum of its proper divisors (132836733).

398229891 is a wasteful number, since it uses less digits than its factorization.

398229891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23361.

The product of its digits is 559872, while the sum is 51.

The square root of 398229891 is about 19955.6982087824. The cubic root of 398229891 is about 735.7178363446.

The spelling of 398229891 in words is "three hundred ninety-eight million, two hundred twenty-nine thousand, eight hundred ninety-one".