398032321 has 2 divisors, whose sum is σ = 398032322. Its totient is φ = 398032320.

The previous prime is 398032301. The next prime is 398032361. The reversal of 398032321 is 123230893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268960000 + 129072321 = 16400^2 + 11361^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398032321 is a prime.

It is not a weakly prime, because it can be changed into another prime (398032301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199016160 + 199016161.

It is an arithmetic number, because the mean of its divisors is an integer number (199016161).

Almost surely, 2^398032321 is an apocalyptic number.

It is an amenable number.

398032321 is a deficient number, since it is larger than the sum of its proper divisors (1).

398032321 is an equidigital number, since it uses as much as digits as its factorization.

398032321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 398032321 is about 19950.7473794843. The cubic root of 398032321 is about 735.5961479926.

It can be divided in two parts, 39803 and 2321, that added together give a palindrome (42124).

The spelling of 398032321 in words is "three hundred ninety-eight million, thirty-two thousand, three hundred twenty-one".