709997 has 4 divisors (see below), whose sum is σ = 727356. Its totient is φ = 692640.

The previous prime is 709991. The next prime is 710009. The reversal of 709997 is 799907.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799907 = 29 ⋅27583.

It can be written as a sum of positive squares in 2 ways, for example, as 292681 + 417316 = 541^2 + 646^2 .

It is a cyclic number.

It is not a de Polignac number, because 709997 - 2⁴ = 709981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 17317 = 709997 / (7 + 0 + 9 + 9 + 9 + 7).

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709991) 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, 8618 + ... + 8699.

It is an arithmetic number, because the mean of its divisors is an integer number (181839).

2⁷⁰⁹⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

709997 is a deficient number, since it is larger than the sum of its proper divisors (17359).

709997 is a wasteful number, since it uses less digits than its factorization.

709997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17358.

The product of its (nonzero) digits is 35721, while the sum is 41.

The square root of 709997 is about 842.6131971433. The cubic root of 709997 is about 89.2110883948.

The spelling of 709997 in words is "seven hundred nine thousand, nine hundred ninety-seven".