905640 has 32 divisors (see below), whose sum is σ = 2717280. Its totient is φ = 241472.

The previous prime is 905629. The next prime is 905647. The reversal of 905640 is 46509.

905640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 905640.

It is not an unprimeable number, because it can be changed into a prime (905647) 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, 3654 + ... + 3893.

It is an arithmetic number, because the mean of its divisors is an integer number (84915).

2⁹⁰⁵⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

905640 is an abundant number, since it is smaller than the sum of its proper divisors (1811640).

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

905640 is a wasteful number, since it uses less digits than its factorization.

905640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7561 (or 7557 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 905640 is about 951.6511966051. The cubic root of 905640 is about 96.7501986388.

The spelling of 905640 in words is "nine hundred five thousand, six hundred forty".