721850 has 12 divisors (see below), whose sum is σ = 1342734. Its totient is φ = 288720.

The previous prime is 721849. The next prime is 721859. The reversal of 721850 is 58127.

721850 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 534361 + 187489 = 731^2 + 433^2 .

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

It is not an unprimeable number, because it can be changed into a prime (721859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7169 + ... + 7268.

2⁷²¹⁸⁵⁰ is an apocalyptic number.

721850 is a deficient number, since it is larger than the sum of its proper divisors (620884).

721850 is a wasteful number, since it uses less digits than its factorization.

721850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14449 (or 14444 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 721850 is about 849.6175610238. The cubic root of 721850 is about 89.7047940807.

Adding to 721850 its reverse (58127), we get a palindrome (779977).

The spelling of 721850 in words is "seven hundred twenty-one thousand, eight hundred fifty".