1006638 has 32 divisors (see below), whose sum is σ = 2177280. Its totient is φ = 309120.

The previous prime is 1006637. The next prime is 1006651. The reversal of 1006638 is 8366001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1006633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7173 + ... + 7311.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1006638 is an apocalyptic number.

1006638 is an abundant number, since it is smaller than the sum of its proper divisors (1170642).

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

1006638 is a wasteful number, since it uses less digits than its factorization.

1006638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1006638 is about 1003.3135103247. The cubic root of 1006638 is about 100.2207788748.

The spelling of 1006638 in words is "one million, six thousand, six hundred thirty-eight".