745209 has 12 divisors (see below), whose sum is σ = 1111552. Its totient is φ = 480600.

The previous prime is 745201. The next prime is 745231. The reversal of 745209 is 902547.

It is not a de Polignac number, because 745209 - 2³ = 745201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1057 + ... + 1614.

2⁷⁴⁵²⁰⁹ is an apocalyptic number.

It is an amenable number.

745209 is a deficient number, since it is larger than the sum of its proper divisors (366343).

745209 is a wasteful number, since it uses less digits than its factorization.

745209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708 (or 2705 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 745209 is about 863.2548870409. The cubic root of 745209 is about 90.6621534542.

It can be divided in two parts, 74520 and 9, that added together give a square (74529 = 273²).

The spelling of 745209 in words is "seven hundred forty-five thousand, two hundred nine".