745409 has 4 divisors (see below), whose sum is σ = 851904. Its totient is φ = 638916.

The previous prime is 745397. The next prime is 745471. The reversal of 745409 is 904547.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904547 = 7 ⋅129221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-745409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (745609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53237 + ... + 53250.

It is an arithmetic number, because the mean of its divisors is an integer number (212976).

2⁷⁴⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

745409 is a deficient number, since it is larger than the sum of its proper divisors (106495).

745409 is a wasteful number, since it uses less digits than its factorization.

745409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106494.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 745409 is about 863.3707199112. The cubic root of 745409 is about 90.6702633978.

The spelling of 745409 in words is "seven hundred forty-five thousand, four hundred nine".