3981706243 has 2 divisors, whose sum is σ = 3981706244. Its totient is φ = 3981706242.

The previous prime is 3981706219. The next prime is 3981706277. The reversal of 3981706243 is 3426071893.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3981706243 - 2²¹ = 3979609091 is a prime.

It is a super-3 number, since 3×3981706243³ (a number of 30 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3981706243.

It is not a weakly prime, because it can be changed into another prime (3981706283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990853121 + 1990853122.

It is an arithmetic number, because the mean of its divisors is an integer number (1990853122).

Almost surely, 2^3981706243 is an apocalyptic number.

3981706243 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981706243 is an equidigital number, since it uses as much as digits as its factorization.

3981706243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 3981706243 is about 63100.7626182125. The cubic root of 3981706243 is about 1584.9773926260.

The spelling of 3981706243 in words is "three billion, nine hundred eighty-one million, seven hundred six thousand, two hundred forty-three".