2149639 has 4 divisors (see below), whose sum is σ = 2195424. Its totient is φ = 2103856.

The previous prime is 2149621. The next prime is 2149661. The reversal of 2149639 is 9369412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2149639 - 2⁵ = 2149607 is a prime.

It is a Duffinian number.

2149639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2149619) 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, 22822 + ... + 22915.

It is an arithmetic number, because the mean of its divisors is an integer number (548856).

2^2149639 is an apocalyptic number.

2149639 is a deficient number, since it is larger than the sum of its proper divisors (45785).

2149639 is an equidigital number, since it uses as much as digits as its factorization.

2149639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45784.

The product of its digits is 11664, while the sum is 34.

The square root of 2149639 is about 1466.1647247155. The cubic root of 2149639 is about 129.0590639530.

The spelling of 2149639 in words is "two million, one hundred forty-nine thousand, six hundred thirty-nine".