1985139 has 36 divisors (see below), whose sum is σ = 3328416. Its totient is φ = 1132704.

The previous prime is 1985077. The next prime is 1985167. The reversal of 1985139 is 9315891.

It is a happy number.

It is not a de Polignac number, because 1985139 - 2¹⁷ = 1854067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985189) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 42214 + ... + 42260.

It is an arithmetic number, because the mean of its divisors is an integer number (92456).

2^1985139 is an apocalyptic number.

1985139 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1985139 is a deficient number, since it is larger than the sum of its proper divisors (1343277).

1985139 is a wasteful number, since it uses less digits than its factorization.

1985139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 82 counting only the distinct ones).

The product of its digits is 9720, while the sum is 36.

The square root of 1985139 is about 1408.9496087511. The cubic root of 1985139 is about 125.6792674134.

It can be divided in two parts, 19 and 85139, that added together give a palindrome (85158).

The spelling of 1985139 in words is "one million, nine hundred eighty-five thousand, one hundred thirty-nine".