2139939 has 20 divisors (see below), whose sum is σ = 3310560. Its totient is φ = 1375920.

The previous prime is 2139937. The next prime is 2139947. The reversal of 2139939 is 9399312.

It is not a de Polignac number, because 2139939 - 2¹ = 2139937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2139931) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1894 + ... + 2804.

It is an arithmetic number, because the mean of its divisors is an integer number (165528).

2^2139939 is an apocalyptic number.

2139939 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2139939 is a deficient number, since it is larger than the sum of its proper divisors (1170621).

2139939 is an equidigital number, since it uses as much as digits as its factorization.

2139939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 952 (or 943 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 2139939 is about 1462.8530343134. The cubic root of 2139939 is about 128.8646498160.

The spelling of 2139939 in words is "two million, one hundred thirty-nine thousand, nine hundred thirty-nine".