704721 has 4 divisors (see below), whose sum is σ = 939632. Its totient is φ = 469812.

The previous prime is 704719. The next prime is 704731. The reversal of 704721 is 127407.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 704721 - 2¹ = 704719 is a prime.

It is a D-number.

It is a Duffinian number.

704721 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 704721.

It is not an unprimeable number, because it can be changed into a prime (704731) 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, 117451 + ... + 117456.

It is an arithmetic number, because the mean of its divisors is an integer number (234908).

2⁷⁰⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

704721 is a deficient number, since it is larger than the sum of its proper divisors (234911).

704721 is a wasteful number, since it uses less digits than its factorization.

704721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234910.

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 704721 is about 839.4766226644. The cubic root of 704721 is about 88.9895623832.

The spelling of 704721 in words is "seven hundred four thousand, seven hundred twenty-one", and thus it is an iban number.