2139917 has 8 divisors (see below), whose sum is σ = 2329656. Its totient is φ = 1953792.

The previous prime is 2139911. The next prime is 2139919. The reversal of 2139917 is 7199312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 434281 + 1705636 = 659^2 + 1306^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2139917 - 2⁸ = 2139661 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139911) 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, 413 + ... + 2109.

It is an arithmetic number, because the mean of its divisors is an integer number (291207).

2^2139917 is an apocalyptic number.

It is an amenable number.

2139917 is a deficient number, since it is larger than the sum of its proper divisors (189739).

2139917 is a wasteful number, since it uses less digits than its factorization.

2139917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1807.

The product of its digits is 3402, while the sum is 32.

The square root of 2139917 is about 1462.8455147417. The cubic root of 2139917 is about 128.8642082097.

The spelling of 2139917 in words is "two million, one hundred thirty-nine thousand, nine hundred seventeen".