1638894112 has 96 divisors (see below), whose sum is σ = 3554772480. Its totient is φ = 740413440.

The previous prime is 1638894109. The next prime is 1638894133. The reversal of 1638894112 is 2114988361.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2647339 + ... + 2647957.

It is an arithmetic number, because the mean of its divisors is an integer number (37028880).

Almost surely, 2^1638894112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1638894112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1777386240).

1638894112 is an abundant number, since it is smaller than the sum of its proper divisors (1915878368).

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

1638894112 is a wasteful number, since it uses less digits than its factorization.

1638894112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 826 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 1638894112 is about 40483.2571812101. The cubic root of 1638894112 is about 1179.0085783416.

The spelling of 1638894112 in words is "one billion, six hundred thirty-eight million, eight hundred ninety-four thousand, one hundred twelve".