2139641 has 4 divisors (see below), whose sum is σ = 2445312. Its totient is φ = 1833972.

The previous prime is 2139611. The next prime is 2139653. The reversal of 2139641 is 1469312.

2139641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2139641 - 2¹⁴ = 2123257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139641.

It is not an unprimeable number, because it can be changed into a prime (2139611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152825 + ... + 152838.

It is an arithmetic number, because the mean of its divisors is an integer number (611328).

2^2139641 is an apocalyptic number.

It is an amenable number.

2139641 is a deficient number, since it is larger than the sum of its proper divisors (305671).

2139641 is an equidigital number, since it uses as much as digits as its factorization.

2139641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305670.

The product of its digits is 1296, while the sum is 26.

The square root of 2139641 is about 1462.7511750123. The cubic root of 2139641 is about 128.8586678000.

The spelling of 2139641 in words is "two million, one hundred thirty-nine thousand, six hundred forty-one".