38806991 has 2 divisors, whose sum is σ = 38806992. Its totient is φ = 38806990.

The previous prime is 38806981. The next prime is 38806997. The reversal of 38806991 is 19960883.

It is a strong prime.

It is an emirp because it is prime and its reverse (19960883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38806991 - 2²² = 34612687 is a 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 (38806997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19403495 + 19403496.

It is an arithmetic number, because the mean of its divisors is an integer number (19403496).

Almost surely, 2^38806991 is an apocalyptic number.

38806991 is a deficient number, since it is larger than the sum of its proper divisors (1).

38806991 is an equidigital number, since it uses as much as digits as its factorization.

38806991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 38806991 is about 6229.5257443886. The cubic root of 38806991 is about 338.5607878397.

The spelling of 38806991 in words is "thirty-eight million, eight hundred six thousand, nine hundred ninety-one".