3981739 has 2 divisors, whose sum is σ = 3981740. Its totient is φ = 3981738.

The previous prime is 3981709. The next prime is 3981749. The reversal of 3981739 is 9371893.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3981739 - 2⁵ = 3981707 is a prime.

It is not a weakly prime, because it can be changed into another prime (3981709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990869 + 1990870.

It is an arithmetic number, because the mean of its divisors is an integer number (1990870).

Almost surely, 2^3981739 is an apocalyptic number.

3981739 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981739 is an equidigital number, since it uses as much as digits as its factorization.

3981739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 40.

The square root of 3981739 is about 1995.4295276957. The cubic root of 3981739 is about 158.4981739084.

The spelling of 3981739 in words is "three million, nine hundred eighty-one thousand, seven hundred thirty-nine".