2660239 has 4 divisors (see below), whose sum is σ = 2686680. Its totient is φ = 2633800.

The previous prime is 2660237. The next prime is 2660291. The reversal of 2660239 is 9320662.

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 2660239 - 2¹ = 2660237 is a prime.

It is an Ulam number.

It is a Duffinian number.

2660239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660237) 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, 13069 + ... + 13270.

It is an arithmetic number, because the mean of its divisors is an integer number (671670).

2^2660239 is an apocalyptic number.

2660239 is a deficient number, since it is larger than the sum of its proper divisors (26441).

2660239 is a wasteful number, since it uses less digits than its factorization.

2660239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26440.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 2660239 is about 1631.0239115353. The cubic root of 2660239 is about 138.5607478521.

The spelling of 2660239 in words is "two million, six hundred sixty thousand, two hundred thirty-nine".