9809861 has 4 divisors (see below), whose sum is σ = 9887232. Its totient is φ = 9732492.

The previous prime is 9809843. The next prime is 9809893. The reversal of 9809861 is 1689089.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1689089 = 431 ⋅3919.

It is a cyclic number.

It is not a de Polignac number, because 9809861 - 2⁶ = 9809797 is a prime.

It is a super-3 number, since 3×9809861³ (a number of 22 digits) contains 333 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 (9809161) 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, 38495 + ... + 38748.

It is an arithmetic number, because the mean of its divisors is an integer number (2471808).

Almost surely, 2^9809861 is an apocalyptic number.

It is an amenable number.

9809861 is a deficient number, since it is larger than the sum of its proper divisors (77371).

9809861 is a wasteful number, since it uses less digits than its factorization.

9809861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77370.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 9809861 is about 3132.0697629523. The cubic root of 9809861 is about 214.0692485592.

The spelling of 9809861 in words is "nine million, eight hundred nine thousand, eight hundred sixty-one".