1609139 has 16 divisors (see below), whose sum is σ = 1932288. Its totient is φ = 1311552.

The previous prime is 1609109. The next prime is 1609141. The reversal of 1609139 is 9319061.

It is a cyclic number.

It is not a de Polignac number, because 1609139 - 2⁸ = 1608883 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1609109) 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, 22007 + ... + 22079.

It is an arithmetic number, because the mean of its divisors is an integer number (120768).

2^1609139 is an apocalyptic number.

1609139 is a deficient number, since it is larger than the sum of its proper divisors (323149).

1609139 is an equidigital number, since it uses as much as digits as its factorization.

1609139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 1609139 is about 1268.5184271425. The cubic root of 1609139 is about 117.1829751971.

The spelling of 1609139 in words is "one million, six hundred nine thousand, one hundred thirty-nine".