1638012 has 12 divisors (see below), whose sum is σ = 3822056. Its totient is φ = 546000.

The previous prime is 1638011. The next prime is 1638019. The reversal of 1638012 is 2108361.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1638012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68239 + ... + 68262.

2^1638012 is an apocalyptic number.

1638012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1638012 is an abundant number, since it is smaller than the sum of its proper divisors (2184044).

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

1638012 is a wasteful number, since it uses less digits than its factorization.

1638012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136508 (or 136506 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1638012 is about 1279.8484285258. The cubic root of 1638012 is about 117.8797012047.

The spelling of 1638012 in words is "one million, six hundred thirty-eight thousand, twelve".