745809 has 8 divisors (see below), whose sum is σ = 1021440. Its totient is φ = 483696.

The previous prime is 745757. The next prime is 745817. The reversal of 745809 is 908547.

745809 = T₁₈₂ + T₁₈₃ + ... + T₂₁₈.

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

It is not a de Polignac number, because 745809 - 2¹³ = 737617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 745809.

It is not an unprimeable number, because it can be changed into a prime (745859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3249 + ... + 3470.

It is an arithmetic number, because the mean of its divisors is an integer number (127680).

2⁷⁴⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

745809 is a deficient number, since it is larger than the sum of its proper divisors (275631).

745809 is a wasteful number, since it uses less digits than its factorization.

745809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 745809 is about 863.6023390427. The cubic root of 745809 is about 90.6864789340.

The spelling of 745809 in words is "seven hundred forty-five thousand, eight hundred nine".