2205639 has 6 divisors (see below), whose sum is σ = 3185936. Its totient is φ = 1470420.

The previous prime is 2205629. The next prime is 2205649. The reversal of 2205639 is 9365022.

2205639 = 175² + 176² + ... + 228².

2205639 is a `hidden beast` number, since 2 + 20 + 5 + 639 = 666.

It is an interprime number because it is at equal distance from previous prime (2205629) and next prime (2205649).

It is not a de Polignac number, because 2205639 - 2¹² = 2201543 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 2²¹ + 0 + 5 + 6⁶ + 3¹⁰ + 9³ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205629) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 122527 + ... + 122544.

2^2205639 is an apocalyptic number.

2205639 is a deficient number, since it is larger than the sum of its proper divisors (980297).

2205639 is a wasteful number, since it uses less digits than its factorization.

2205639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245077 (or 245074 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 2205639 is about 1485.1393873977. The cubic root of 2205639 is about 130.1701716233.

The spelling of 2205639 in words is "two million, two hundred five thousand, six hundred thirty-nine".