398680321 has 12 divisors (see below), whose sum is σ = 448834708. Its totient is φ = 352005984.

The previous prime is 398680309. The next prime is 398680339. The reversal of 398680321 is 123086893.

It can be written as a sum of positive squares in 2 ways, for example, as 54169600 + 344510721 = 7360^2 + 18561^2 .

It is not a de Polignac number, because 398680321 - 2²⁷ = 264462593 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398680361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22110 + ... + 35863.

Almost surely, 2^398680321 is an apocalyptic number.

It is an amenable number.

398680321 is a deficient number, since it is larger than the sum of its proper divisors (50154387).

398680321 is a wasteful number, since it uses less digits than its factorization.

398680321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58032 (or 58009 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 398680321 is about 19966.9807682584. The cubic root of 398680321 is about 735.9951171551.

The spelling of 398680321 in words is "three hundred ninety-eight million, six hundred eighty thousand, three hundred twenty-one".