1286139 has 8 divisors (see below), whose sum is σ = 1734480. Its totient is φ = 847616.

The previous prime is 1286119. The next prime is 1286147. The reversal of 1286139 is 9316821.

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

It is a cyclic number.

It is not a de Polignac number, because 1286139 - 2⁵ = 1286107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1286119) 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, 2142 + ... + 2675.

It is an arithmetic number, because the mean of its divisors is an integer number (216810).

2^1286139 is an apocalyptic number.

1286139 is a deficient number, since it is larger than the sum of its proper divisors (448341).

1286139 is an equidigital number, since it uses as much as digits as its factorization.

1286139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909.

The product of its digits is 2592, while the sum is 30.

The square root of 1286139 is about 1134.0806849603. The cubic root of 1286139 is about 108.7500092482.

The spelling of 1286139 in words is "one million, two hundred eighty-six thousand, one hundred thirty-nine".