745440 has 48 divisors (see below), whose sum is σ = 2349648. Its totient is φ = 198656.

The previous prime is 745397. The next prime is 745471. The reversal of 745440 is 44547.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 745440.

It is a congruent number.

It is an unprimeable number.

745440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 297 + ... + 1256.

It is an arithmetic number, because the mean of its divisors is an integer number (48951).

2⁷⁴⁵⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

745440 is an abundant number, since it is smaller than the sum of its proper divisors (1604208).

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

745440 is a wasteful number, since it uses less digits than its factorization.

745440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571 (or 1563 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 745440 is about 863.3886726151. The cubic root of 745440 is about 90.6715203092.

Adding to 745440 its reverse (44547), we get a palindrome (789987).

The spelling of 745440 in words is "seven hundred forty-five thousand, four hundred forty".