4021739 has 2 divisors, whose sum is σ = 4021740. Its totient is φ = 4021738.

The previous prime is 4021733. The next prime is 4021751. The reversal of 4021739 is 9371204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4021739 - 2¹⁶ = 3956203 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4021733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010869 + 2010870.

It is an arithmetic number, because the mean of its divisors is an integer number (2010870).

Almost surely, 2^4021739 is an apocalyptic number.

4021739 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021739 is an equidigital number, since it uses as much as digits as its factorization.

4021739 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 4021739 is about 2005.4273858707. The cubic root of 4021739 is about 159.0271567343.

The spelling of 4021739 in words is "four million, twenty-one thousand, seven hundred thirty-nine".