3940247 has 2 divisors, whose sum is σ = 3940248. Its totient is φ = 3940246.

The previous prime is 3940231. The next prime is 3940249. The reversal of 3940247 is 7420493.

It is a strong prime.

It is an emirp because it is prime and its reverse (7420493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3940247 - 2⁴ = 3940231 is a prime.

Together with 3940249, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3940249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1970123 + 1970124.

It is an arithmetic number, because the mean of its divisors is an integer number (1970124).

Almost surely, 2^3940247 is an apocalyptic number.

3940247 is a deficient number, since it is larger than the sum of its proper divisors (1).

3940247 is an equidigital number, since it uses as much as digits as its factorization.

3940247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 3940247 is about 1985.0055415540. The cubic root of 3940247 is about 157.9457031824.

The spelling of 3940247 in words is "three million, nine hundred forty thousand, two hundred forty-seven".