721344399 has 8 divisors (see below), whose sum is σ = 963151920. Its totient is φ = 480216576.

The previous prime is 721344397. The next prime is 721344409. The reversal of 721344399 is 993443127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721344399 - 2¹ = 721344397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 721344399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721344397) 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, 167442 + ... + 171695.

It is an arithmetic number, because the mean of its divisors is an integer number (120393990).

Almost surely, 2^721344399 is an apocalyptic number.

721344399 is a deficient number, since it is larger than the sum of its proper divisors (241807521).

721344399 is a wasteful number, since it uses less digits than its factorization.

721344399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339849.

The product of its digits is 163296, while the sum is 42.

The square root of 721344399 is about 26857.8554430543. The cubic root of 721344399 is about 896.8384539475.

The spelling of 721344399 in words is "seven hundred twenty-one million, three hundred forty-four thousand, three hundred ninety-nine".