398198491 has 8 divisors (see below), whose sum is σ = 400536864. Its totient is φ = 395867520.

The previous prime is 398198453. The next prime is 398198509. The reversal of 398198491 is 194891893.

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

It is a cyclic number.

It is not a de Polignac number, because 398198491 - 2⁹ = 398197979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398198401) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 133185 + ... + 136141.

It is an arithmetic number, because the mean of its divisors is an integer number (50067108).

Almost surely, 2^398198491 is an apocalyptic number.

398198491 is a deficient number, since it is larger than the sum of its proper divisors (2338373).

398198491 is a wasteful number, since it uses less digits than its factorization.

398198491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3701.

The product of its digits is 559872, while the sum is 52.

The square root of 398198491 is about 19954.9114505678. The cubic root of 398198491 is about 735.6984989821.

The spelling of 398198491 in words is "three hundred ninety-eight million, one hundred ninety-eight thousand, four hundred ninety-one".