1005139 has 4 divisors (see below), whose sum is σ = 1009120. Its totient is φ = 1001160.

The previous prime is 1005133. The next prime is 1005143. The reversal of 1005139 is 9315001.

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 1005139 - 2³ = 1005131 is a prime.

It is a Duffinian number.

1005139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1005131) 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, 1584 + ... + 2125.

It is an arithmetic number, because the mean of its divisors is an integer number (252280).

2^1005139 is an apocalyptic number.

1005139 is a deficient number, since it is larger than the sum of its proper divisors (3981).

1005139 is an equidigital number, since it uses as much as digits as its factorization.

1005139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3980.

The product of its (nonzero) digits is 135, while the sum is 19.

The square root of 1005139 is about 1002.5662072901. The cubic root of 1005139 is about 100.1710073980.

The spelling of 1005139 in words is "one million, five thousand, one hundred thirty-nine".