1213986 has 32 divisors (see below), whose sum is σ = 2672640. Its totient is φ = 365904.

The previous prime is 1213981. The next prime is 1214011. The reversal of 1213986 is 6893121.

It is not an unprimeable number, because it can be changed into a prime (1213981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2391 + ... + 2853.

It is an arithmetic number, because the mean of its divisors is an integer number (83520).

2^1213986 is an apocalyptic number.

1213986 is an abundant number, since it is smaller than the sum of its proper divisors (1458654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213986 is a wasteful number, since it uses less digits than its factorization.

1213986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510.

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

The square root of 1213986 is about 1101.8103285049. The cubic root of 1213986 is about 106.6771061831.

The spelling of 1213986 in words is "one million, two hundred thirteen thousand, nine hundred eighty-six".