10219987 has 4 divisors (see below), whose sum is σ = 10549696. Its totient is φ = 9890280.

The previous prime is 10219973. The next prime is 10219991. The reversal of 10219987 is 78991201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10219987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10219997) 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, 164808 + ... + 164869.

It is an arithmetic number, because the mean of its divisors is an integer number (2637424).

Almost surely, 2^10219987 is an apocalyptic number.

10219987 is a deficient number, since it is larger than the sum of its proper divisors (329709).

10219987 is an equidigital number, since it uses as much as digits as its factorization.

10219987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329708.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 10219987 is about 3196.8714393920. The cubic root of 10219987 is about 217.0118492542.

The spelling of 10219987 in words is "ten million, two hundred nineteen thousand, nine hundred eighty-seven".