2639447249 has 4 divisors (see below), whose sum is σ = 2640926064. Its totient is φ = 2637968436.

The previous prime is 2639447243. The next prime is 2639447257. The reversal of 2639447249 is 9427449362.

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.

It is a cyclic number.

It is not a de Polignac number, because 2639447249 - 2⁸ = 2639446993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2639447197 and 2639447206.

It is not an unprimeable number, because it can be changed into a prime (2639447243) 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, 736727 + ... + 740300.

It is an arithmetic number, because the mean of its divisors is an integer number (660231516).

Almost surely, 2^2639447249 is an apocalyptic number.

It is an amenable number.

2639447249 is a deficient number, since it is larger than the sum of its proper divisors (1478815).

2639447249 is a wasteful number, since it uses less digits than its factorization.

2639447249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478814.

The product of its digits is 2612736, while the sum is 50.

The square root of 2639447249 is about 51375.5510822025. The cubic root of 2639447249 is about 1381.9881811040.

The spelling of 2639447249 in words is "two billion, six hundred thirty-nine million, four hundred forty-seven thousand, two hundred forty-nine".