1200321399 has 8 divisors (see below), whose sum is σ = 1615386240. Its totient is φ = 792735416.

The previous prime is 1200321389. The next prime is 1200321433. The reversal of 1200321399 is 9931230021.

It is a happy number.

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 1200321399 - 2¹⁵ = 1200288631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200321319) 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, 1869339 + ... + 1869980.

It is an arithmetic number, because the mean of its divisors is an integer number (201923280).

Almost surely, 2^1200321399 is an apocalyptic number.

1200321399 is a deficient number, since it is larger than the sum of its proper divisors (415064841).

1200321399 is a wasteful number, since it uses less digits than its factorization.

1200321399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739429.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1200321399 is about 34645.6548357799. The cubic root of 1200321399 is about 1062.7534322144.

The spelling of 1200321399 in words is "one billion, two hundred million, three hundred twenty-one thousand, three hundred ninety-nine".