398342321 has 8 divisors (see below), whose sum is σ = 429345000. Its totient is φ = 367391232.

The previous prime is 398342297. The next prime is 398342339. The reversal of 398342321 is 123243893.

It can be written as a sum of positive squares in 4 ways, for example, as 11826721 + 386515600 = 3439^2 + 19660^2 .

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

It is not a de Polignac number, because 398342321 - 2²² = 394148017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (398342381) 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, 3971 + ... + 28503.

It is an arithmetic number, because the mean of its divisors is an integer number (53668125).

Almost surely, 2^398342321 is an apocalyptic number.

It is an amenable number.

398342321 is a deficient number, since it is larger than the sum of its proper divisors (31002679).

398342321 is a wasteful number, since it uses less digits than its factorization.

398342321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25795.

The product of its digits is 31104, while the sum is 35.

The square root of 398342321 is about 19958.5149998691. The cubic root of 398342321 is about 735.7870668529.

The spelling of 398342321 in words is "three hundred ninety-eight million, three hundred forty-two thousand, three hundred twenty-one".