2049665439 has 4 divisors (see below), whose sum is σ = 2732887256. Its totient is φ = 1366443624.

The previous prime is 2049665437. The next prime is 2049665459. The reversal of 2049665439 is 9345669402.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2049665439 - 2¹ = 2049665437 is a prime.

It is a super-2 number, since 2×2049665439² = 8402256823662125442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2049665437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 341610904 + ... + 341610909.

It is an arithmetic number, because the mean of its divisors is an integer number (683221814).

Almost surely, 2^2049665439 is an apocalyptic number.

2049665439 is a deficient number, since it is larger than the sum of its proper divisors (683221817).

2049665439 is an equidigital number, since it uses as much as digits as its factorization.

2049665439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683221816.

The product of its (nonzero) digits is 1399680, while the sum is 48.

The square root of 2049665439 is about 45273.2309317548. The cubic root of 2049665439 is about 1270.2649826315.

The spelling of 2049665439 in words is "two billion, forty-nine million, six hundred sixty-five thousand, four hundred thirty-nine".