1638108 has 18 divisors (see below), whose sum is σ = 4140864. Its totient is φ = 546024.

The previous prime is 1638107. The next prime is 1638121. The reversal of 1638108 is 8018361.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22716 + ... + 22787.

It is an arithmetic number, because the mean of its divisors is an integer number (230048).

2^1638108 is an apocalyptic number.

1638108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1638108 is an abundant number, since it is smaller than the sum of its proper divisors (2502756).

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

1638108 is a wasteful number, since it uses less digits than its factorization.

1638108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45513 (or 45508 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1638108 is about 1279.8859324174. The cubic root of 1638108 is about 117.8820040430.

The spelling of 1638108 in words is "one million, six hundred thirty-eight thousand, one hundred eight".