708921 has 12 divisors (see below), whose sum is σ = 1031472. Its totient is φ = 469176.

The previous prime is 708913. The next prime is 708923. The reversal of 708921 is 129807.

708921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 708921 - 2³ = 708913 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 708921.

It is not an unprimeable number, because it can be changed into a prime (708923) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1870 + ... + 2216.

It is an arithmetic number, because the mean of its divisors is an integer number (85956).

2⁷⁰⁸⁹²¹ is an apocalyptic number.

It is an amenable number.

708921 is a deficient number, since it is larger than the sum of its proper divisors (322551).

708921 is a wasteful number, since it uses less digits than its factorization.

708921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 708921 is about 841.9744651710. The cubic root of 708921 is about 89.1659991604.

The spelling of 708921 in words is "seven hundred eight thousand, nine hundred twenty-one".