391298321 has 8 divisors (see below), whose sum is σ = 395215200. Its totient is φ = 387389632.

The previous prime is 391298279. The next prime is 391298329. The reversal of 391298321 is 123892193.

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 391298321 - 2¹⁰ = 391297297 is a prime.

It is a super-2 number, since 2×391298321² = 306228752034838082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391298329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143630 + ... + 146328.

It is an arithmetic number, because the mean of its divisors is an integer number (49401900).

Almost surely, 2^391298321 is an apocalyptic number.

It is an amenable number.

391298321 is a deficient number, since it is larger than the sum of its proper divisors (3916879).

391298321 is a wasteful number, since it uses less digits than its factorization.

391298321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4095.

The product of its digits is 23328, while the sum is 38.

The square root of 391298321 is about 19781.2618657152. The cubic root of 391298321 is about 731.4242046695.

The spelling of 391298321 in words is "three hundred ninety-one million, two hundred ninety-eight thousand, three hundred twenty-one".