1006640 has 20 divisors (see below), whose sum is σ = 2340624. Its totient is φ = 402624.

The previous prime is 1006637. The next prime is 1006651. The reversal of 1006640 is 466001.

1006640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

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, 6212 + ... + 6371.

2^1006640 is an apocalyptic number.

1006640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1006640 is an abundant number, since it is smaller than the sum of its proper divisors (1333984).

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

1006640 is a wasteful number, since it uses less digits than its factorization.

1006640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12596 (or 12590 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1006640 is about 1003.3145070216. The cubic root of 1006640 is about 100.2208452481.

The spelling of 1006640 in words is "one million, six thousand, six hundred forty".