721876 has 12 divisors (see below), whose sum is σ = 1270080. Its totient is φ = 359000.

The previous prime is 721859. The next prime is 721883. The reversal of 721876 is 678127.

It is a happy number.

721876 is nontrivially palindromic in base 3.

It is a super-2 number, since 2×721876² = 1042209918752, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645 + ... + 1363.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2⁷²¹⁸⁷⁶ is an apocalyptic number.

It is an amenable number.

721876 is a deficient number, since it is larger than the sum of its proper divisors (548204).

721876 is a wasteful number, since it uses less digits than its factorization.

721876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 972 counting only the distinct ones).

The product of its digits is 4704, while the sum is 31.

The square root of 721876 is about 849.6328618880. The cubic root of 721876 is about 89.7058710804.

The spelling of 721876 in words is "seven hundred twenty-one thousand, eight hundred seventy-six".