2001638 has 8 divisors (see below), whose sum is σ = 3106080. Its totient is φ = 966280.

The previous prime is 2001619. The next prime is 2001641. The reversal of 2001638 is 8361002.

It is a sphenic number, since it is the product of 3 distinct primes.

2001638 is a modest number, since divided by 1638 gives 2 as remainder.

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, 17198 + ... + 17313.

It is an arithmetic number, because the mean of its divisors is an integer number (388260).

2^2001638 is an apocalyptic number.

2001638 is a deficient number, since it is larger than the sum of its proper divisors (1104442).

2001638 is a wasteful number, since it uses less digits than its factorization.

2001638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34542.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 2001638 is about 1414.7925643005. The cubic root of 2001638 is about 126.0264914484.

The spelling of 2001638 in words is "two million, one thousand, six hundred thirty-eight".