38640647 has 2 divisors, whose sum is σ = 38640648. Its totient is φ = 38640646.

The previous prime is 38640631. The next prime is 38640649. The reversal of 38640647 is 74604683.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38640647 - 2⁴ = 38640631 is a prime.

Together with 38640649, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38640647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38640649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19320323 + 19320324.

It is an arithmetic number, because the mean of its divisors is an integer number (19320324).

Almost surely, 2^38640647 is an apocalyptic number.

38640647 is a deficient number, since it is larger than the sum of its proper divisors (1).

38640647 is an equidigital number, since it uses as much as digits as its factorization.

38640647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 38.

The square root of 38640647 is about 6216.1601491596. The cubic root of 38640647 is about 338.0763543759.

The spelling of 38640647 in words is "thirty-eight million, six hundred forty thousand, six hundred forty-seven".