721034 has 8 divisors (see below), whose sum is σ = 1085700. Its totient is φ = 359136.

The previous prime is 721013. The next prime is 721037. The reversal of 721034 is 430127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 600625 + 120409 = 775^2 + 347^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (721037) 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, 182 + ... + 1214.

2⁷²¹⁰³⁴ is an apocalyptic number.

721034 is a deficient number, since it is larger than the sum of its proper divisors (364666).

721034 is a wasteful number, since it uses less digits than its factorization.

721034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 721034 is about 849.1372091718. The cubic root of 721034 is about 89.6709797096.

The spelling of 721034 in words is "seven hundred twenty-one thousand, thirty-four".