721672943 has 4 divisors (see below), whose sum is σ = 721771848. Its totient is φ = 721574040.

The previous prime is 721672937. The next prime is 721672969. The reversal of 721672943 is 349276127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349276127 = 743 ⋅470089.

It is a cyclic number.

It is not a de Polignac number, because 721672943 - 2⁴ = 721672927 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721672943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721672993) 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, 37553 + ... + 53418.

It is an arithmetic number, because the mean of its divisors is an integer number (180442962).

Almost surely, 2^721672943 is an apocalyptic number.

721672943 is a deficient number, since it is larger than the sum of its proper divisors (98905).

721672943 is an equidigital number, since it uses as much as digits as its factorization.

721672943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98904.

The product of its digits is 127008, while the sum is 41.

The square root of 721672943 is about 26863.9710951304. The cubic root of 721672943 is about 896.9745914942.

The spelling of 721672943 in words is "seven hundred twenty-one million, six hundred seventy-two thousand, nine hundred forty-three".