38863991 has 2 divisors, whose sum is σ = 38863992. Its totient is φ = 38863990.

The previous prime is 38863969. The next prime is 38864009. The reversal of 38863991 is 19936883.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38863991 - 2¹⁸ = 38601847 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38863961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19431995 + 19431996.

It is an arithmetic number, because the mean of its divisors is an integer number (19431996).

Almost surely, 2^38863991 is an apocalyptic number.

38863991 is a deficient number, since it is larger than the sum of its proper divisors (1).

38863991 is an equidigital number, since it uses as much as digits as its factorization.

38863991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 47.

The square root of 38863991 is about 6234.0990527902. The cubic root of 38863991 is about 338.7264669590.

The spelling of 38863991 in words is "thirty-eight million, eight hundred sixty-three thousand, nine hundred ninety-one".