745439 has 4 divisors (see below), whose sum is σ = 765624. Its totient is φ = 725256.

The previous prime is 745397. The next prime is 745471. The reversal of 745439 is 934547.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 745439 - 2¹² = 741343 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 (745939) 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, 10037 + ... + 10110.

It is an arithmetic number, because the mean of its divisors is an integer number (191406).

2⁷⁴⁵⁴³⁹ is an apocalyptic number.

745439 is a deficient number, since it is larger than the sum of its proper divisors (20185).

745439 is a wasteful number, since it uses less digits than its factorization.

745439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20184.

The product of its digits is 15120, while the sum is 32.

The square root of 745439 is about 863.3880935014. The cubic root of 745439 is about 90.6714797642.

The spelling of 745439 in words is "seven hundred forty-five thousand, four hundred thirty-nine".