1638126 has 24 divisors (see below), whose sum is σ = 4056624. Its totient is φ = 468000.

The previous prime is 1638121. The next prime is 1638127. The reversal of 1638126 is 6218361.

1638126 is a `hidden beast` number, since 1 + 638 + 1 + 26 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1638126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6375 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (169026).

2^1638126 is an apocalyptic number.

1638126 is an abundant number, since it is smaller than the sum of its proper divisors (2418498).

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

1638126 is a wasteful number, since it uses less digits than its factorization.

1638126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016 (or 13013 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 1638126 is about 1279.8929642747. The cubic root of 1638126 is about 117.8824358152.

It can be divided in two parts, 1638 and 126, that added together give a square (1764 = 42²).

The spelling of 1638126 in words is "one million, six hundred thirty-eight thousand, one hundred twenty-six".