745840 has 20 divisors (see below), whose sum is σ = 1734264. Its totient is φ = 298304.

The previous prime is 745837. The next prime is 745859. The reversal of 745840 is 48547.

It is a tau number, because it is divible by the number of its divisors (20).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 745799 and 745808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4582 + ... + 4741.

2⁷⁴⁵⁸⁴⁰ is an apocalyptic number.

It is an amenable number.

745840 is an abundant number, since it is smaller than the sum of its proper divisors (988424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745840 is a wasteful number, since it uses less digits than its factorization.

745840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9336 (or 9330 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 28.

The square root of 745840 is about 863.6202869317. The cubic root of 745840 is about 90.6877353960.

The spelling of 745840 in words is "seven hundred forty-five thousand, eight hundred forty".