2102639 has 24 divisors (see below), whose sum is σ = 2757888. Its totient is φ = 1584240.

The previous prime is 2102629. The next prime is 2102647. The reversal of 2102639 is 9362012.

It is not a de Polignac number, because 2102639 - 2⁴ = 2102623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25292 + ... + 25374.

It is an arithmetic number, because the mean of its divisors is an integer number (114912).

2^2102639 is an apocalyptic number.

2102639 is a deficient number, since it is larger than the sum of its proper divisors (655249).

2102639 is a wasteful number, since it uses less digits than its factorization.

2102639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2102639 is about 1450.0479302423. The cubic root of 2102639 is about 128.1115360827. Note that the first 3 decimals are identical.

The spelling of 2102639 in words is "two million, one hundred two thousand, six hundred thirty-nine".