2129639 has 4 divisors (see below), whose sum is σ = 2222256. Its totient is φ = 2037024.

The previous prime is 2129627. The next prime is 2129671. The reversal of 2129639 is 9369212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2129639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2129689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46274 + ... + 46319.

It is an arithmetic number, because the mean of its divisors is an integer number (555564).

2^2129639 is an apocalyptic number.

2129639 is a deficient number, since it is larger than the sum of its proper divisors (92617).

2129639 is an equidigital number, since it uses as much as digits as its factorization.

2129639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92616.

The product of its digits is 5832, while the sum is 32.

The square root of 2129639 is about 1459.3282701298. The cubic root of 2129639 is about 128.6575658532.

The spelling of 2129639 in words is "two million, one hundred twenty-nine thousand, six hundred thirty-nine".