1284139 has 4 divisors (see below), whose sum is σ = 1290024. Its totient is φ = 1278256.

The previous prime is 1284131. The next prime is 1284169. The reversal of 1284139 is 9314821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1284139 - 2³ = 1284131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2602 + ... + 3055.

It is an arithmetic number, because the mean of its divisors is an integer number (322506).

2^1284139 is an apocalyptic number.

1284139 is a deficient number, since it is larger than the sum of its proper divisors (5885).

1284139 is an equidigital number, since it uses as much as digits as its factorization.

1284139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5884.

The product of its digits is 1728, while the sum is 28.

The square root of 1284139 is about 1133.1985704191. The cubic root of 1284139 is about 108.6936097309.

It can be divided in two parts, 12841 and 39, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 1284139 in words is "one million, two hundred eighty-four thousand, one hundred thirty-nine".