38938991 has 16 divisors (see below), whose sum is σ = 48136704. Its totient is φ = 30672864.

The previous prime is 38938987. The next prime is 38939011. The reversal of 38938991 is 19983983.

38938991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 38938991 - 2² = 38938987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38938901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23120 + ... + 24746.

It is an arithmetic number, because the mean of its divisors is an integer number (3008544).

Almost surely, 2^38938991 is an apocalyptic number.

38938991 is a deficient number, since it is larger than the sum of its proper divisors (9197713).

38938991 is a wasteful number, since it uses less digits than its factorization.

38938991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1910.

The product of its digits is 419904, while the sum is 50.

The square root of 38938991 is about 6240.1114573379. Note that the first 3 decimals coincide. The cubic root of 38938991 is about 338.9442191760.

The spelling of 38938991 in words is "thirty-eight million, nine hundred thirty-eight thousand, nine hundred ninety-one".