38908993 has 6 divisors (see below), whose sum is σ = 39197894. Its totient is φ = 38621184.

The previous prime is 38908901. The next prime is 38909011. The reversal of 38908993 is 39980983.

It can be written as a sum of positive squares in 3 ways, for example, as 5071504 + 33837489 = 2252^2 + 5817^2 .

It is a de Polignac number, because none of the positive numbers 2^k-38908993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38906993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86433 + ... + 86881.

Almost surely, 2^38908993 is an apocalyptic number.

It is an amenable number.

38908993 is a deficient number, since it is larger than the sum of its proper divisors (288901).

38908993 is an frugal number, since it uses more digits than its factorization.

38908993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 38908993 is about 6237.7073512630. The cubic root of 38908993 is about 338.8571576768.

The spelling of 38908993 in words is "thirty-eight million, nine hundred eight thousand, nine hundred ninety-three".