709990 has 8 divisors (see below), whose sum is σ = 1278000. Its totient is φ = 283992.

The previous prime is 709981. The next prime is 709991. The reversal of 709990 is 99907.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709991) by changing a digit.

709990 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 35490 + ... + 35509.

It is an arithmetic number, because the mean of its divisors is an integer number (159750).

2⁷⁰⁹⁹⁹⁰ is an apocalyptic number.

709990 is a deficient number, since it is larger than the sum of its proper divisors (568010).

709990 is a wasteful number, since it uses less digits than its factorization.

709990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71006.

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 709990 is about 842.6090433885. The cubic root of 709990 is about 89.2107952106.

The spelling of 709990 in words is "seven hundred nine thousand, nine hundred ninety".