721748943 has 12 divisors (see below), whose sum is σ = 1048352760. Its totient is φ = 478476816.

The previous prime is 721748927. The next prime is 721748981. The reversal of 721748943 is 349847127.

It is not a de Polignac number, because 721748943 - 2⁴ = 721748927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721748983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222396 + ... + 225617.

It is an arithmetic number, because the mean of its divisors is an integer number (87362730).

Almost surely, 2^721748943 is an apocalyptic number.

721748943 is a deficient number, since it is larger than the sum of its proper divisors (326603817).

721748943 is a wasteful number, since it uses less digits than its factorization.

721748943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448198 (or 448195 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 721748943 is about 26865.3855918727. The cubic root of 721748943 is about 897.0060774449.

The spelling of 721748943 in words is "seven hundred twenty-one million, seven hundred forty-eight thousand, nine hundred forty-three".