1231986 has 16 divisors (see below), whose sum is σ = 2816064. Its totient is φ = 351984.

The previous prime is 1231981. The next prime is 1231987. The reversal of 1231986 is 6891321.

It is not an unprimeable number, because it can be changed into a prime (1231981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14625 + ... + 14708.

It is an arithmetic number, because the mean of its divisors is an integer number (176004).

2^1231986 is an apocalyptic number.

1231986 is an abundant number, since it is smaller than the sum of its proper divisors (1584078).

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

1231986 is a wasteful number, since it uses less digits than its factorization.

1231986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29345.

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

The square root of 1231986 is about 1109.9486474608. The cubic root of 1231986 is about 107.2017621490.

The spelling of 1231986 in words is "one million, two hundred thirty-one thousand, nine hundred eighty-six".