3980726861 has 2 divisors, whose sum is σ = 3980726862. Its totient is φ = 3980726860.

The previous prime is 3980726857. The next prime is 3980726891. The reversal of 3980726861 is 1686270893.

3980726861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3086358025 + 894368836 = 55555^2 + 29906^2 .

It is a cyclic number.

It is not a de Polignac number, because 3980726861 - 2² = 3980726857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3980726821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990363430 + 1990363431.

It is an arithmetic number, because the mean of its divisors is an integer number (1990363431).

Almost surely, 2^3980726861 is an apocalyptic number.

It is an amenable number.

3980726861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3980726861 is an equidigital number, since it uses as much as digits as its factorization.

3980726861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 3980726861 is about 63093.0016800596. The cubic root of 3980726861 is about 1584.8474294457.

The spelling of 3980726861 in words is "three billion, nine hundred eighty million, seven hundred twenty-six thousand, eight hundred sixty-one".