2139665 has 8 divisors (see below), whose sum is σ = 2801088. Its totient is φ = 1556080.

The previous prime is 2139661. The next prime is 2139677. The reversal of 2139665 is 5669312.

It is a happy number.

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

It is not a de Polignac number, because 2139665 - 2² = 2139661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19397 + ... + 19506.

It is an arithmetic number, because the mean of its divisors is an integer number (350136).

2^2139665 is an apocalyptic number.

It is an amenable number.

2139665 is a deficient number, since it is larger than the sum of its proper divisors (661423).

2139665 is a wasteful number, since it uses less digits than its factorization.

2139665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38919.

The product of its digits is 9720, while the sum is 32.

The square root of 2139665 is about 1462.7593787086. The cubic root of 2139665 is about 128.8591495937.

The spelling of 2139665 in words is "two million, one hundred thirty-nine thousand, six hundred sixty-five".