398326791 has 8 divisors (see below), whose sum is σ = 534173040. Its totient is φ = 264015872.

The previous prime is 398326783. The next prime is 398326801. The reversal of 398326791 is 197623893.

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 398326791 - 2³ = 398326783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 398326791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398326751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 383226 + ... + 384263.

It is an arithmetic number, because the mean of its divisors is an integer number (66771630).

Almost surely, 2^398326791 is an apocalyptic number.

398326791 is a deficient number, since it is larger than the sum of its proper divisors (135846249).

398326791 is a wasteful number, since it uses less digits than its factorization.

398326791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767665.

The product of its digits is 489888, while the sum is 48.

The square root of 398326791 is about 19958.1259390755. The cubic root of 398326791 is about 735.7775047911. Note that the first 3 decimals are identical.

The spelling of 398326791 in words is "three hundred ninety-eight million, three hundred twenty-six thousand, seven hundred ninety-one".