706821 has 4 divisors (see below), whose sum is σ = 942432. Its totient is φ = 471212.

The previous prime is 706801. The next prime is 706829. The reversal of 706821 is 128607.

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 a cyclic number.

It is not a de Polignac number, because 706821 - 2⁶ = 706757 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 706791 and 706800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706829) 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, 117801 + ... + 117806.

It is an arithmetic number, because the mean of its divisors is an integer number (235608).

2⁷⁰⁶⁸²¹ is an apocalyptic number.

It is an amenable number.

706821 is a deficient number, since it is larger than the sum of its proper divisors (235611).

706821 is a wasteful number, since it uses less digits than its factorization.

706821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235610.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 706821 is about 840.7264715709. The cubic root of 706821 is about 89.0778681390.

The spelling of 706821 in words is "seven hundred six thousand, eight hundred twenty-one".