721946349 has 24 divisors (see below), whose sum is σ = 1055734680. Its totient is φ = 475362432.

The previous prime is 721946317. The next prime is 721946399. The reversal of 721946349 is 943649127.

It is a happy number.

721946349 is a `hidden beast` number, since 7 + 2 + 1 + 9 + 4 + 634 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 91584900 + 630361449 = 9570^2 + 25107^2 .

It is not a de Polignac number, because 721946349 - 2⁵ = 721946317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721946399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364927 + ... + 366899.

It is an arithmetic number, because the mean of its divisors is an integer number (43988945).

Almost surely, 2^721946349 is an apocalyptic number.

It is an amenable number.

721946349 is a deficient number, since it is larger than the sum of its proper divisors (333788331).

721946349 is a wasteful number, since it uses less digits than its factorization.

721946349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461 (or 2458 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 721946349 is about 26869.0593248070. The cubic root of 721946349 is about 897.0878502192.

The spelling of 721946349 in words is "seven hundred twenty-one million, nine hundred forty-six thousand, three hundred forty-nine".