6620239 has 4 divisors (see below), whose sum is σ = 6627600. Its totient is φ = 6612880.

The previous prime is 6620231. The next prime is 6620261. The reversal of 6620239 is 9320266.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9320266 = 2 ⋅4660133.

It is a cyclic number.

It is not a de Polignac number, because 6620239 - 2³ = 6620231 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620231) 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, 2107 + ... + 4204.

It is an arithmetic number, because the mean of its divisors is an integer number (1656900).

Almost surely, 2^6620239 is an apocalyptic number.

6620239 is a deficient number, since it is larger than the sum of its proper divisors (7361).

6620239 is a wasteful number, since it uses less digits than its factorization.

6620239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7360.

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

The square root of 6620239 is about 2572.9825106285. The cubic root of 6620239 is about 187.7692865484.

It can be divided in two parts, 6620 and 239, that added together give a cube (6859 = 19³).

The spelling of 6620239 in words is "six million, six hundred twenty thousand, two hundred thirty-nine".