1281992 has 16 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 636880.

The previous prime is 1281983. The next prime is 1282007. The reversal of 1281992 is 2991821.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109 + ... + 1947.

It is an arithmetic number, because the mean of its divisors is an integer number (151200).

2^1281992 is an apocalyptic number.

It is an amenable number.

1281992 is a deficient number, since it is larger than the sum of its proper divisors (1137208).

1281992 is a wasteful number, since it uses less digits than its factorization.

1281992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036 (or 1032 counting only the distinct ones).

The product of its digits is 2592, while the sum is 32.

The square root of 1281992 is about 1132.2508555969. The cubic root of 1281992 is about 108.6329996364.

The spelling of 1281992 in words is "one million, two hundred eighty-one thousand, nine hundred ninety-two".