1223986 has 4 divisors (see below), whose sum is σ = 1835982. Its totient is φ = 611992.

The previous prime is 1223977. The next prime is 1223987. The reversal of 1223986 is 6893221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 81225 = 1069^2 + 285^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1223987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305995 + ... + 305998.

2^1223986 is an apocalyptic number.

1223986 is a deficient number, since it is larger than the sum of its proper divisors (611996).

1223986 is an equidigital number, since it uses as much as digits as its factorization.

1223986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611995.

The product of its digits is 5184, while the sum is 31.

The square root of 1223986 is about 1106.3390077187. The cubic root of 1223986 is about 106.9692169870.

It can be divided in two parts, 1223 and 986, that added together give a square (2209 = 47²).

The spelling of 1223986 in words is "one million, two hundred twenty-three thousand, nine hundred eighty-six".