2639216 has 40 divisors (see below), whose sum is σ = 5606784. Its totient is φ = 1198080.

The previous prime is 2639213. The next prime is 2639239. The reversal of 2639216 is 6129362.

It is a super-2 number, since 2×2639216² = 13930922189312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8276 + ... + 8588.

2^2639216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2639216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2803392).

2639216 is an abundant number, since it is smaller than the sum of its proper divisors (2967568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2639216 is a wasteful number, since it uses less digits than its factorization.

2639216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369 (or 363 counting only the distinct ones).

The product of its digits is 3888, while the sum is 29.

The square root of 2639216 is about 1624.5664036905. The cubic root of 2639216 is about 138.1947820037.

The spelling of 2639216 in words is "two million, six hundred thirty-nine thousand, two hundred sixteen".