321906397 has 8 divisors (see below), whose sum is σ = 325620000. Its totient is φ = 318206064.

The previous prime is 321906383. The next prime is 321906443. The reversal of 321906397 is 793609123.

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 321906397 - 2⁷ = 321906269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321906307) 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, 50379 + ... + 56407.

It is an arithmetic number, because the mean of its divisors is an integer number (40702500).

Almost surely, 2^321906397 is an apocalyptic number.

It is an amenable number.

321906397 is a deficient number, since it is larger than the sum of its proper divisors (3713603).

321906397 is a wasteful number, since it uses less digits than its factorization.

321906397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6635.

The product of its (nonzero) digits is 61236, while the sum is 40.

The square root of 321906397 is about 17941.7501097301. The cubic root of 321906397 is about 685.3459789881.

The spelling of 321906397 in words is "three hundred twenty-one million, nine hundred six thousand, three hundred ninety-seven".