721375383 has 4 divisors (see below), whose sum is σ = 961833848. Its totient is φ = 480916920.

The previous prime is 721375379. The next prime is 721375393. The reversal of 721375383 is 383573127.

It is a happy number.

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

It is not a de Polignac number, because 721375383 - 2² = 721375379 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 (721375393) 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, 120229228 + ... + 120229233.

It is an arithmetic number, because the mean of its divisors is an integer number (240458462).

Almost surely, 2^721375383 is an apocalyptic number.

721375383 is a deficient number, since it is larger than the sum of its proper divisors (240458465).

721375383 is a wasteful number, since it uses less digits than its factorization.

721375383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240458464.

The product of its digits is 105840, while the sum is 39.

The square root of 721375383 is about 26858.4322513433. The cubic root of 721375383 is about 896.8512944367.

The spelling of 721375383 in words is "seven hundred twenty-one million, three hundred seventy-five thousand, three hundred eighty-three".