10209987 has 6 divisors (see below), whose sum is σ = 14747772. Its totient is φ = 6806652.

The previous prime is 10209971. The next prime is 10210007. The reversal of 10209987 is 78990201.

It is a happy number.

It is not a de Polignac number, because 10209987 - 2⁴ = 10209971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10209487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 567213 + ... + 567230.

It is an arithmetic number, because the mean of its divisors is an integer number (2457962).

Almost surely, 2^10209987 is an apocalyptic number.

10209987 is a deficient number, since it is larger than the sum of its proper divisors (4537785).

10209987 is a wasteful number, since it uses less digits than its factorization.

10209987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134449 (or 1134446 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 10209987 is about 3195.3070275014. The cubic root of 10209987 is about 216.9410459456.

The spelling of 10209987 in words is "ten million, two hundred nine thousand, nine hundred eighty-seven".