1187564 has 36 divisors (see below), whose sum is σ = 2480184. Its totient is φ = 495936.

The previous prime is 1187561. The next prime is 1187567. The reversal of 1187564 is 4657811.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1187561) and next prime (1187567).

It is a self number, because there is not a number n which added to its sum of digits gives 1187564.

It is not an unprimeable number, because it can be changed into a prime (1187561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14267 + ... + 14349.

It is an arithmetic number, because the mean of its divisors is an integer number (68894).

2^1187564 is an apocalyptic number.

1187564 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1187564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1240092).

1187564 is an abundant number, since it is smaller than the sum of its proper divisors (1292620).

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

1187564 is a wasteful number, since it uses less digits than its factorization.

1187564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 165 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 1187564 is about 1089.7541007035. The cubic root of 1187564 is about 105.8974919772.

The spelling of 1187564 in words is "one million, one hundred eighty-seven thousand, five hundred sixty-four".