4020447649 has 9 divisors (see below), whose sum is σ = 4055690163. Its totient is φ = 3985510392.

The previous prime is 4020447637. The next prime is 4020447653. The reversal of 4020447649 is 9467440204.

The square root of 4020447649 is 63407.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 949071249 + 3071376400 = 30807^2 + 55420^2 .

It is not a de Polignac number, because 4020447649 - 2¹⁷ = 4020316577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020447619) 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 8 ways as a sum of consecutive naturals, for example, 10335147 + ... + 10335535.

Almost surely, 2^4020447649 is an apocalyptic number.

4020447649 is the 63407-th square number.

4020447649 is the 31704-th centered octagonal number.

It is an amenable number.

4020447649 is a deficient number, since it is larger than the sum of its proper divisors (35242514).

4020447649 is an frugal number, since it uses more digits than its factorization.

4020447649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 552 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 40.

The cubic root of 4020447649 is about 1590.1013409294.

The spelling of 4020447649 in words is "four billion, twenty million, four hundred forty-seven thousand, six hundred forty-nine".