706991 has 4 divisors (see below), whose sum is σ = 731400. Its totient is φ = 682584.

The previous prime is 706987. The next prime is 706999. The reversal of 706991 is 199607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199607 = 29 ⋅6883.

It is a cyclic number.

It is not a de Polignac number, because 706991 - 2² = 706987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (706999) 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, 12161 + ... + 12218.

It is an arithmetic number, because the mean of its divisors is an integer number (182850).

2⁷⁰⁶⁹⁹¹ is an apocalyptic number.

706991 is a deficient number, since it is larger than the sum of its proper divisors (24409).

706991 is a wasteful number, since it uses less digits than its factorization.

706991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24408.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 706991 is about 840.8275685300. The cubic root of 706991 is about 89.0850090435.

The spelling of 706991 in words is "seven hundred six thousand, nine hundred ninety-one".