10819987 has 16 divisors (see below), whose sum is σ = 11988000. Its totient is φ = 9725184.

The previous prime is 10819979. The next prime is 10820009. The reversal of 10819987 is 78991801.

It is a cyclic number.

It is not a de Polignac number, because 10819987 - 2³ = 10819979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10819937) 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 15 ways as a sum of consecutive naturals, for example, 40089 + ... + 40357.

It is an arithmetic number, because the mean of its divisors is an integer number (749250).

Almost surely, 2^10819987 is an apocalyptic number.

10819987 is a deficient number, since it is larger than the sum of its proper divisors (1168013).

10819987 is a wasteful number, since it uses less digits than its factorization.

10819987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 10819987 is about 3289.3748646209. The cubic root of 10819987 is about 221.1781628100.

The spelling of 10819987 in words is "ten million, eight hundred nineteen thousand, nine hundred eighty-seven".