1638006 has 8 divisors (see below), whose sum is σ = 3276024. Its totient is φ = 546000.

The previous prime is 1637983. The next prime is 1638011. The reversal of 1638006 is 6008361.

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

1638006 is an admirable number.

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, 136495 + ... + 136506.

It is an arithmetic number, because the mean of its divisors is an integer number (409503).

2^1638006 is an apocalyptic number.

1638006 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1638006 is a wasteful number, since it uses less digits than its factorization.

1638006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273006.

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

The square root of 1638006 is about 1279.8460844961. The cubic root of 1638006 is about 117.8795572743.

The spelling of 1638006 in words is "one million, six hundred thirty-eight thousand, six".