1285869 has 8 divisors (see below), whose sum is σ = 1846432. Its totient is φ = 791280.

The previous prime is 1285859. The next prime is 1285871. The reversal of 1285869 is 9685821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1285869 - 2⁴ = 1285853 is a prime.

It is a super-2 number, since 2×1285869² = 3306918170322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 32971 = 1285869 / (1 + 2 + 8 + 5 + 8 + 6 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16447 + ... + 16524.

It is an arithmetic number, because the mean of its divisors is an integer number (230804).

2^1285869 is an apocalyptic number.

It is an amenable number.

1285869 is a deficient number, since it is larger than the sum of its proper divisors (560563).

1285869 is a wasteful number, since it uses less digits than its factorization.

1285869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32987.

The product of its digits is 34560, while the sum is 39.

The square root of 1285869 is about 1133.9616395628. The cubic root of 1285869 is about 108.7423987288.

The spelling of 1285869 in words is "one million, two hundred eighty-five thousand, eight hundred sixty-nine".