745989 has 8 divisors (see below), whose sum is σ = 1001280. Its totient is φ = 494016.

The previous prime is 745981. The next prime is 745993. The reversal of 745989 is 989547.

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

It is not a de Polignac number, because 745989 - 2³ = 745981 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 745989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (745981) 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, 244 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (125160).

2⁷⁴⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

745989 is a deficient number, since it is larger than the sum of its proper divisors (255291).

745989 is a wasteful number, since it uses less digits than its factorization.

745989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659.

The product of its digits is 90720, while the sum is 42.

The square root of 745989 is about 863.7065473875. The cubic root of 745989 is about 90.6937740338.

Adding to 745989 its sum of digits (42), we get a triangular number (746031 = T₁₂₂₁).

The spelling of 745989 in words is "seven hundred forty-five thousand, nine hundred eighty-nine".