709621 has 8 divisors (see below), whose sum is σ = 799488. Its totient is φ = 624000.

The previous prime is 709609. The next prime is 709649. The reversal of 709621 is 126907.

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

It is a cyclic number.

It is not a de Polignac number, because 709621 - 2⁵ = 709589 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 (709651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 700 + ... + 1381.

It is an arithmetic number, because the mean of its divisors is an integer number (99936).

2⁷⁰⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

709621 is a deficient number, since it is larger than the sum of its proper divisors (89867).

709621 is a wasteful number, since it uses less digits than its factorization.

709621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2123.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 709621 is about 842.3900521730. The cubic root of 709621 is about 89.1953374868.

It can be divided in two parts, 7096 and 21, that added together give a palindrome (7117).

The spelling of 709621 in words is "seven hundred nine thousand, six hundred twenty-one".