721340543 has 8 divisors (see below), whose sum is σ = 899333760. Its totient is φ = 562083480.

The previous prime is 721340533. The next prime is 721340551. The reversal of 721340543 is 345043127.

It is a happy number.

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

It is not a de Polignac number, because 721340543 - 2¹⁴ = 721324159 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 (721340533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4683953 + ... + 4684106.

It is an arithmetic number, because the mean of its divisors is an integer number (112416720).

Almost surely, 2^721340543 is an apocalyptic number.

721340543 is a deficient number, since it is larger than the sum of its proper divisors (177993217).

721340543 is a wasteful number, since it uses less digits than its factorization.

721340543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9368077.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 721340543 is about 26857.7836576289. The cubic root of 721340543 is about 896.8368559059.

The spelling of 721340543 in words is "seven hundred twenty-one million, three hundred forty thousand, five hundred forty-three".