4001243 has 2 divisors, whose sum is σ = 4001244. Its totient is φ = 4001242.

The previous prime is 4001237. The next prime is 4001269. The reversal of 4001243 is 3421004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4001243 - 2⁴ = 4001227 is a prime.

It is not a weakly prime, because it can be changed into another prime (4001213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000621 + 2000622.

It is an arithmetic number, because the mean of its divisors is an integer number (2000622).

Almost surely, 2^4001243 is an apocalyptic number.

4001243 is a deficient number, since it is larger than the sum of its proper divisors (1).

4001243 is an equidigital number, since it uses as much as digits as its factorization.

4001243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 4001243 is about 2000.3107258624. The cubic root of 4001243 is about 158.7565463231.

Adding to 4001243 its reverse (3421004), we get a palindrome (7422247).

The spelling of 4001243 in words is "four million, one thousand, two hundred forty-three".