2112639 has 4 divisors (see below), whose sum is σ = 2816856. Its totient is φ = 1408424.

The previous prime is 2112631. The next prime is 2112683. The reversal of 2112639 is 9362112.

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 2112639 - 2³ = 2112631 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112631) 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, 352104 + ... + 352109.

It is an arithmetic number, because the mean of its divisors is an integer number (704214).

2^2112639 is an apocalyptic number.

2112639 is a deficient number, since it is larger than the sum of its proper divisors (704217).

2112639 is an equidigital number, since it uses as much as digits as its factorization.

2112639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704216.

The product of its digits is 648, while the sum is 24.

The square root of 2112639 is about 1453.4920020420. The cubic root of 2112639 is about 128.3143113802.

It can be divided in two parts, 211 and 2639, that added together give a triangular number (2850 = T₇₅).

The spelling of 2112639 in words is "two million, one hundred twelve thousand, six hundred thirty-nine".