7940047 has 2 divisors, whose sum is σ = 7940048. Its totient is φ = 7940046.

The previous prime is 7940021. The next prime is 7940063. The reversal of 7940047 is 7400497.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7940047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7940017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3970023 + 3970024.

It is an arithmetic number, because the mean of its divisors is an integer number (3970024).

Almost surely, 2^7940047 is an apocalyptic number.

7940047 is a deficient number, since it is larger than the sum of its proper divisors (1).

7940047 is an equidigital number, since it uses as much as digits as its factorization.

7940047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 7940047 is about 2817.8089005467. The cubic root of 7940047 is about 199.4991384020.

The spelling of 7940047 in words is "seven million, nine hundred forty thousand, forty-seven".