721406343 has 16 divisors (see below), whose sum is σ = 1100030976. Its totient is φ = 411952800.

The previous prime is 721406341. The next prime is 721406347. The reversal of 721406343 is 343604127.

It is not a de Polignac number, because 721406343 - 2¹ = 721406341 is a prime.

It is a super-2 number, since 2×721406343² = 1040854223441267298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721406343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721406341) 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 15 ways as a sum of consecutive naturals, for example, 22393 + ... + 44093.

It is an arithmetic number, because the mean of its divisors is an integer number (68751936).

Almost surely, 2^721406343 is an apocalyptic number.

721406343 is a deficient number, since it is larger than the sum of its proper divisors (378624633).

721406343 is a wasteful number, since it uses less digits than its factorization.

721406343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23294.

The product of its (nonzero) digits is 12096, while the sum is 30.

The square root of 721406343 is about 26859.0086004677. The cubic root of 721406343 is about 896.8641246125.

The spelling of 721406343 in words is "seven hundred twenty-one million, four hundred six thousand, three hundred forty-three".