102185987 has 4 divisors (see below), whose sum is σ = 106628880. Its totient is φ = 97743096.

The previous prime is 102185977. The next prime is 102186001. The reversal of 102185987 is 789581201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 102185987 - 2¹⁰ = 102184963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102185917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221412 + ... + 2221457.

It is an arithmetic number, because the mean of its divisors is an integer number (26657220).

Almost surely, 2^102185987 is an apocalyptic number.

102185987 is a deficient number, since it is larger than the sum of its proper divisors (4442893).

102185987 is an equidigital number, since it uses as much as digits as its factorization.

102185987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442892.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 102185987 is about 10108.7084733907. The cubic root of 102185987 is about 467.5166848497.

The spelling of 102185987 in words is "one hundred two million, one hundred eighty-five thousand, nine hundred eighty-seven".