2139309 has 6 divisors (see below), whose sum is σ = 3090126. Its totient is φ = 1426200.

The previous prime is 2139307. The next prime is 2139311. The reversal of 2139309 is 9039312.

It is an interprime number because it is at equal distance from previous prime (2139307) and next prime (2139311).

It can be written as a sum of positive squares in only one way, i.e., 1814409 + 324900 = 1347^2 + 570^2 .

It is not a de Polignac number, because 2139309 - 2¹ = 2139307 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139307) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 118842 + ... + 118859.

It is an arithmetic number, because the mean of its divisors is an integer number (515021).

2^2139309 is an apocalyptic number.

It is an amenable number.

2139309 is a deficient number, since it is larger than the sum of its proper divisors (950817).

2139309 is a wasteful number, since it uses less digits than its factorization.

2139309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237707 (or 237704 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 2139309 is about 1462.6376858265. The cubic root of 2139309 is about 128.8520026179.

The spelling of 2139309 in words is "two million, one hundred thirty-nine thousand, three hundred nine".