1189638 has 48 divisors (see below), whose sum is σ = 2779920. Its totient is φ = 366912.

The previous prime is 1189637. The next prime is 1189649. The reversal of 1189638 is 8369811.

1189638 is a `hidden beast` number, since 1 + 18 + 9 + 638 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22420 + ... + 22472.

It is an arithmetic number, because the mean of its divisors is an integer number (57915).

2^1189638 is an apocalyptic number.

1189638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1189638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1389960).

1189638 is an abundant number, since it is smaller than the sum of its proper divisors (1590282).

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

1189638 is a wasteful number, since it uses less digits than its factorization.

1189638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 130 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 1189638 is about 1090.7052764152. The cubic root of 1189638 is about 105.9591037205.

The spelling of 1189638 in words is "one million, one hundred eighty-nine thousand, six hundred thirty-eight".