2639297989 has 4 divisors (see below), whose sum is σ = 2700677056. Its totient is φ = 2577918924.

The previous prime is 2639297971. The next prime is 2639298029. The reversal of 2639297989 is 9897929362.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9897929362 = 2 ⋅4948964681.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2639297989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2639297989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639297489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30689469 + ... + 30689554.

It is an arithmetic number, because the mean of its divisors is an integer number (675169264).

Almost surely, 2^2639297989 is an apocalyptic number.

It is an amenable number.

2639297989 is a deficient number, since it is larger than the sum of its proper divisors (61379067).

2639297989 is an equidigital number, since it uses as much as digits as its factorization.

2639297989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61379066.

The product of its digits is 26453952, while the sum is 64.

The square root of 2639297989 is about 51374.0984251792. The cubic root of 2639297989 is about 1381.9621302653.

The spelling of 2639297989 in words is "two billion, six hundred thirty-nine million, two hundred ninety-seven thousand, nine hundred eighty-nine".