12099861 has 10 divisors (see below), whose sum is σ = 18075222. Its totient is φ = 8066520.

The previous prime is 12099859. The next prime is 12099883. The reversal of 12099861 is 16899021.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 93636 = 3465^2 + 306^2 .

It is not a de Polignac number, because 12099861 - 2¹ = 12099859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12099161) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74610 + ... + 74771.

Almost surely, 2^12099861 is an apocalyptic number.

It is an amenable number.

12099861 is a deficient number, since it is larger than the sum of its proper divisors (5975361).

12099861 is an equidigital number, since it uses as much as digits as its factorization.

12099861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149393 (or 149384 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 12099861 is about 3478.4854462826. The cubic root of 12099861 is about 229.5761633665.

The spelling of 12099861 in words is "twelve million, ninety-nine thousand, eight hundred sixty-one".