38989991 has 8 divisors (see below), whose sum is σ = 40932864. Its totient is φ = 37067800.

The previous prime is 38989981. The next prime is 38990009. The reversal of 38989991 is 19998983.

38989991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38989991 - 2¹⁴ = 38973607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38989901) 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 7 ways as a sum of consecutive naturals, for example, 1235 + ... + 8916.

It is an arithmetic number, because the mean of its divisors is an integer number (5116608).

Almost surely, 2^38989991 is an apocalyptic number.

38989991 is a deficient number, since it is larger than the sum of its proper divisors (1942873).

38989991 is a wasteful number, since it uses less digits than its factorization.

38989991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10341.

The product of its digits is 1259712, while the sum is 56.

The square root of 38989991 is about 6244.1965856305. The cubic root of 38989991 is about 339.0921310198.

The spelling of 38989991 in words is "thirty-eight million, nine hundred eighty-nine thousand, nine hundred ninety-one".