10209986 has 4 divisors (see below), whose sum is σ = 15314982. Its totient is φ = 5104992.

The previous prime is 10209971. The next prime is 10210007. The reversal of 10209986 is 68990201.

10209986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68990201 = 7 ⋅9855743.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 4280761 = 2435^2 + 2069^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2552495 + ... + 2552498.

Almost surely, 2^10209986 is an apocalyptic number.

10209986 is a deficient number, since it is larger than the sum of its proper divisors (5104996).

10209986 is an equidigital number, since it uses as much as digits as its factorization.

10209986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104995.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 10209986 is about 3195.3068710219. The cubic root of 10209986 is about 216.9410388630.

The spelling of 10209986 in words is "ten million, two hundred nine thousand, nine hundred eighty-six".