1231916 has 12 divisors (see below), whose sum is σ = 2463888. Its totient is φ = 527952.

The previous prime is 1231889. The next prime is 1231943. The reversal of 1231916 is 6191321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1231889) and next prime (1231943).

1231916 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1231891 and 1231900.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21971 + ... + 22026.

It is an arithmetic number, because the mean of its divisors is an integer number (205324).

2^1231916 is an apocalyptic number.

It is an amenable number.

1231916 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1231916 is a wasteful number, since it uses less digits than its factorization.

1231916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44008 (or 44006 counting only the distinct ones).

The product of its digits is 324, while the sum is 23.

The square root of 1231916 is about 1109.9171140225. The cubic root of 1231916 is about 107.1997317510.

The spelling of 1231916 in words is "one million, two hundred thirty-one thousand, nine hundred sixteen".