38643641 has 2 divisors, whose sum is σ = 38643642. Its totient is φ = 38643640.

The previous prime is 38643637. The next prime is 38643653. The reversal of 38643641 is 14634683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23001616 + 15642025 = 4796^2 + 3955^2 .

It is a cyclic number.

It is not a de Polignac number, because 38643641 - 2² = 38643637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (38649641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19321820 + 19321821.

It is an arithmetic number, because the mean of its divisors is an integer number (19321821).

Almost surely, 2^38643641 is an apocalyptic number.

It is an amenable number.

38643641 is a deficient number, since it is larger than the sum of its proper divisors (1).

38643641 is an equidigital number, since it uses as much as digits as its factorization.

38643641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 35.

The square root of 38643641 is about 6216.4009684061. The cubic root of 38643641 is about 338.0850858934.

The spelling of 38643641 in words is "thirty-eight million, six hundred forty-three thousand, six hundred forty-one".