1189836 has 48 divisors (see below), whose sum is σ = 3225600. Its totient is φ = 378576.

The previous prime is 1189831. The next prime is 1189843. The reversal of 1189836 is 6389811.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1189836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1189831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2245 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (67200).

2^1189836 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 1189836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612800).

1189836 is an abundant number, since it is smaller than the sum of its proper divisors (2035764).

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

1189836 is a wasteful number, since it uses less digits than its factorization.

1189836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 507 counting only the distinct ones).

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

The square root of 1189836 is about 1090.7960395968. The cubic root of 1189836 is about 105.9649819061.

It can be divided in two parts, 1189 and 836, that added together give a square (2025 = 45²).

The spelling of 1189836 in words is "one million, one hundred eighty-nine thousand, eight hundred thirty-six".