3980726649 has 9 divisors (see below), whose sum is σ = 5750211909. Its totient is φ = 2653691580.

The previous prime is 3980726639. The next prime is 3980726669. The reversal of 3980726649 is 9466270893.

It is a happy number.

The square root of 3980726649 is 63093.

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

3980726649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 3980726649 - 2¹³ = 3980718457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3980726595 and 3980726604.

It is not an unprimeable number, because it can be changed into a prime (3980726609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 178764 + ... + 199794.

Almost surely, 2^3980726649 is an apocalyptic number.

3980726649 is the 63093-rd square number.

3980726649 is the 31547-th centered octagonal number.

It is an amenable number.

3980726649 is a deficient number, since it is larger than the sum of its proper divisors (1769485260).

3980726649 is an frugal number, since it uses more digits than its factorization.

3980726649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42068 (or 21034 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The cubic root of 3980726649 is about 1584.8474013112.

The spelling of 3980726649 in words is "three billion, nine hundred eighty million, seven hundred twenty-six thousand, six hundred forty-nine".