321402399 has 4 divisors (see below), whose sum is σ = 428536536. Its totient is φ = 214268264.

The previous prime is 321402383. The next prime is 321402421. The reversal of 321402399 is 993204123.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321402399 - 2⁴ = 321402383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321402379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53567064 + ... + 53567069.

It is an arithmetic number, because the mean of its divisors is an integer number (107134134).

Almost surely, 2^321402399 is an apocalyptic number.

321402399 is a deficient number, since it is larger than the sum of its proper divisors (107134137).

321402399 is a wasteful number, since it uses less digits than its factorization.

321402399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107134136.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 321402399 is about 17927.6992109975. The cubic root of 321402399 is about 684.9881177899.

The spelling of 321402399 in words is "three hundred twenty-one million, four hundred two thousand, three hundred ninety-nine".