102189636 has 18 divisors (see below), whose sum is σ = 258312782. Its totient is φ = 34063200.

The previous prime is 102189611. The next prime is 102189653. The reversal of 102189636 is 636981201.

102189636 is a `hidden beast` number, since 1 + 0 + 2 + 18 + 9 + 636 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88172100 + 14017536 = 9390^2 + 3744^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2838601 = 102189636 / (1 + 0 + 2 + 1 + 8 + 9 + 6 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 102189636.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 1419265 + ... + 1419336.

Almost surely, 2^102189636 is an apocalyptic number.

It is an amenable number.

102189636 is an abundant number, since it is smaller than the sum of its proper divisors (156123146).

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

102189636 is a wasteful number, since it uses less digits than its factorization.

102189636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2838611 (or 2838606 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 102189636 is about 10108.8889597225. Note that the first 3 decimals coincide. The cubic root of 102189636 is about 467.5222496965.

The spelling of 102189636 in words is "one hundred two million, one hundred eighty-nine thousand, six hundred thirty-six".