2139717 has 4 divisors (see below), whose sum is σ = 2852960. Its totient is φ = 1426476.

The previous prime is 2139691. The next prime is 2139733. The reversal of 2139717 is 7179312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2139717 - 2⁶ = 2139653 is a prime.

It is a D-number.

It is a Duffinian number.

2139717 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 356617 + ... + 356622.

It is an arithmetic number, because the mean of its divisors is an integer number (713240).

2^2139717 is an apocalyptic number.

It is an amenable number.

2139717 is a deficient number, since it is larger than the sum of its proper divisors (713243).

2139717 is an equidigital number, since it uses as much as digits as its factorization.

2139717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713242.

The product of its digits is 2646, while the sum is 30.

The square root of 2139717 is about 1462.7771532260. Note that the first 3 decimals coincide. The cubic root of 2139717 is about 128.8601934676.

The spelling of 2139717 in words is "two million, one hundred thirty-nine thousand, seven hundred seventeen".