2139279 has 8 divisors (see below), whose sum is σ = 2944512. Its totient is φ = 1380120.

The previous prime is 2139233. The next prime is 2139283. The reversal of 2139279 is 9729312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-2139279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11409 + ... + 11594.

It is an arithmetic number, because the mean of its divisors is an integer number (368064).

2^2139279 is an apocalyptic number.

2139279 is a deficient number, since it is larger than the sum of its proper divisors (805233).

2139279 is a wasteful number, since it uses less digits than its factorization.

2139279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23037.

The product of its digits is 6804, while the sum is 33.

The square root of 2139279 is about 1462.6274303458. The cubic root of 2139279 is about 128.8514003084.

Adding to 2139279 its sum of digits (33), we get a palindrome (2139312).

The spelling of 2139279 in words is "two million, one hundred thirty-nine thousand, two hundred seventy-nine".