1286904 has 48 divisors (see below), whose sum is σ = 3407400. Its totient is φ = 404544.

The previous prime is 1286881. The next prime is 1286939. The reversal of 1286904 is 4096821.

It is a super-2 number, since 2×1286904² = 3312243810432, which contains 22 as substring.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 29907 + ... + 29949.

2^1286904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703700).

1286904 is an abundant number, since it is smaller than the sum of its proper divisors (2120496).

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

1286904 is a wasteful number, since it uses less digits than its factorization.

1286904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1286904 is about 1134.4179124115. The cubic root of 1286904 is about 108.7715666040.

The spelling of 1286904 in words is "one million, two hundred eighty-six thousand, nine hundred four".