721344398 has 8 divisors (see below), whose sum is σ = 1099754760. Its totient is φ = 354759480.

The previous prime is 721344397. The next prime is 721344409. The reversal of 721344398 is 893443127.

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

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 3 ways as a sum of consecutive naturals, for example, 2956208 + ... + 2956451.

It is an arithmetic number, because the mean of its divisors is an integer number (137469345).

Almost surely, 2^721344398 is an apocalyptic number.

721344398 is a deficient number, since it is larger than the sum of its proper divisors (378410362).

721344398 is a wasteful number, since it uses less digits than its factorization.

721344398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912722.

The product of its digits is 145152, while the sum is 41.

The square root of 721344398 is about 26857.8554244377. The cubic root of 721344398 is about 896.8384535331.

The spelling of 721344398 in words is "seven hundred twenty-one million, three hundred forty-four thousand, three hundred ninety-eight".