721948 has 12 divisors (see below), whose sum is σ = 1276632. Its totient is φ = 357200.

The previous prime is 721921. The next prime is 721951. The reversal of 721948 is 849127.

It is a congruent number.

It is an unprimeable number.

721948 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490 + ... + 1297.

It is an arithmetic number, because the mean of its divisors is an integer number (106386).

2⁷²¹⁹⁴⁸ is an apocalyptic number.

It is an amenable number.

721948 is a deficient number, since it is larger than the sum of its proper divisors (554684).

721948 is a wasteful number, since it uses less digits than its factorization.

721948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892 (or 1890 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 721948 is about 849.6752320740. The cubic root of 721948 is about 89.7088534061.

The spelling of 721948 in words is "seven hundred twenty-one thousand, nine hundred forty-eight".