12309861 has 16 divisors (see below), whose sum is σ = 16838208. Its totient is φ = 7996800.

The previous prime is 12309811. The next prime is 12309877. The reversal of 12309861 is 16890321.

It is not a de Polignac number, because 12309861 - 2⁶ = 12309797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24826 + ... + 25316.

It is an arithmetic number, because the mean of its divisors is an integer number (1052388).

Almost surely, 2^12309861 is an apocalyptic number.

It is an amenable number.

12309861 is a deficient number, since it is larger than the sum of its proper divisors (4528347).

12309861 is a wasteful number, since it uses less digits than its factorization.

12309861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 12309861 is about 3508.5411498228. The cubic root of 12309861 is about 230.8966948735.

The spelling of 12309861 in words is "twelve million, three hundred nine thousand, eight hundred sixty-one".