10686989 has 4 divisors (see below), whose sum is σ = 10742556. Its totient is φ = 10631424.

The previous prime is 10686983. The next prime is 10687007. The reversal of 10686989 is 98968601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98968601 = 709 ⋅139589.

It can be written as a sum of positive squares in 2 ways, for example, as 5244100 + 5442889 = 2290^2 + 2333^2 .

It is a cyclic number.

It is not a de Polignac number, because 10686989 - 2⁸ = 10686733 is a prime.

It is a super-2 number, since 2×10686989² = 228423467772242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10686983) 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, 27494 + ... + 27879.

It is an arithmetic number, because the mean of its divisors is an integer number (2685639).

Almost surely, 2^10686989 is an apocalyptic number.

It is an amenable number.

10686989 is a deficient number, since it is larger than the sum of its proper divisors (55567).

10686989 is an equidigital number, since it uses as much as digits as its factorization.

10686989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55566.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 10686989 is about 3269.0960524279. The cubic root of 10686989 is about 220.2681922097.

It can be divided in two parts, 106869 and 89, that multiplied together give a triangular number (9511341 = T₄₃₆₁).

The spelling of 10686989 in words is "ten million, six hundred eighty-six thousand, nine hundred eighty-nine".