1286385 has 16 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 680960.

The previous prime is 1286381. The next prime is 1286387. The reversal of 1286385 is 5836821.

It is a happy number.

It is not a de Polignac number, because 1286385 - 2² = 1286381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1286381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2641 + ... + 3089.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

2^1286385 is an apocalyptic number.

1286385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1286385 is a deficient number, since it is larger than the sum of its proper divisors (787215).

1286385 is a wasteful number, since it uses less digits than its factorization.

1286385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its digits is 11520, while the sum is 33.

The square root of 1286385 is about 1134.1891376662. The cubic root of 1286385 is about 108.7569423498.

The spelling of 1286385 in words is "one million, two hundred eighty-six thousand, three hundred eighty-five".