709978 has 8 divisors (see below), whose sum is σ = 1101780. Its totient is φ = 342720.

The previous prime is 709967. The next prime is 709981. The reversal of 709978 is 879907.

It can be written as a sum of positive squares in 2 ways, for example, as 700569 + 9409 = 837^2 + 97^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 709978.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6063 + ... + 6178.

2⁷⁰⁹⁹⁷⁸ is an apocalyptic number.

709978 is a deficient number, since it is larger than the sum of its proper divisors (391802).

709978 is a wasteful number, since it uses less digits than its factorization.

709978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 709978 is about 842.6019226183. The cubic root of 709978 is about 89.2102926047.

The spelling of 709978 in words is "seven hundred nine thousand, nine hundred seventy-eight".