It is a happy number.
It is a tau number, because it is divible by the number of its divisors (36).
It is a congruent number.
It is an unprimeable number.
21187604 is an apocalyptic number.
It is an amenable number.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1187604 is a wasteful number, since it uses less digits than its factorization.
1187604 is an odious number, because the sum of its binary digits is odd.
The square root of 1187604 is about 1089.7724533131. The cubic root of 1187604 is about 105.8986809242.
The spelling of 1187604 in words is "one million, one hundred eighty-seven thousand, six hundred four".