721346743 has 8 divisors (see below), whose sum is σ = 795782736. Its totient is φ = 649617600.

The previous prime is 721346729. The next prime is 721346779. The reversal of 721346743 is 347643127.

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

It is a cyclic number.

It is not a de Polignac number, because 721346743 - 2⁵ = 721346711 is a prime.

It is a super-2 number, since 2×721346743² = 1040682247273416098, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721346713) 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 7 ways as a sum of consecutive naturals, for example, 676153 + ... + 677218.

It is an arithmetic number, because the mean of its divisors is an integer number (99472842).

Almost surely, 2^721346743 is an apocalyptic number.

721346743 is a deficient number, since it is larger than the sum of its proper divisors (74435993).

721346743 is a wasteful number, since it uses less digits than its factorization.

721346743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353425.

The product of its digits is 84672, while the sum is 37.

The square root of 721346743 is about 26857.8990801589. The cubic root of 721346743 is about 896.8394253684.

It can be divided in two parts, 7213 and 46743, that added together give a triangular number (53956 = T₃₂₈).

The spelling of 721346743 in words is "seven hundred twenty-one million, three hundred forty-six thousand, seven hundred forty-three".