1028139 has 16 divisors (see below), whose sum is σ = 1581312. Its totient is φ = 582048.

The previous prime is 1028129. The next prime is 1028141. The reversal of 1028139 is 9318201.

It is not a de Polignac number, because 1028139 - 2⁵ = 1028107 is a prime.

1028139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1028129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3492 + ... + 3774.

It is an arithmetic number, because the mean of its divisors is an integer number (98832).

2^1028139 is an apocalyptic number.

1028139 is a deficient number, since it is larger than the sum of its proper divisors (553173).

1028139 is a wasteful number, since it uses less digits than its factorization.

1028139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1028139 is about 1013.9718931016. The cubic root of 1028139 is about 100.9293038583.

The spelling of 1028139 in words is "one million, twenty-eight thousand, one hundred thirty-nine".