1287892 has 12 divisors (see below), whose sum is σ = 2309076. Its totient is φ = 628160.

The previous prime is 1287887. The next prime is 1287899. The reversal of 1287892 is 2987821.

It can be written as a sum of positive squares in 2 ways, for example, as 42436 + 1245456 = 206^2 + 1116^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287899) by changing a digit.

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, 3763 + ... + 4090.

It is an arithmetic number, because the mean of its divisors is an integer number (192423).

2^1287892 is an apocalyptic number.

It is an amenable number.

1287892 is a deficient number, since it is larger than the sum of its proper divisors (1021184).

1287892 is a wasteful number, since it uses less digits than its factorization.

1287892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7898 (or 7896 counting only the distinct ones).

The product of its digits is 16128, while the sum is 37.

The square root of 1287892 is about 1134.8532944835. The cubic root of 1287892 is about 108.7993953614.

The spelling of 1287892 in words is "one million, two hundred eighty-seven thousand, eight hundred ninety-two".