38783891 has 2 divisors, whose sum is σ = 38783892. Its totient is φ = 38783890.

The previous prime is 38783879. The next prime is 38783917. The reversal of 38783891 is 19838783.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38783891 is a prime.

It is not a weakly prime, because it can be changed into another prime (38783791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19391945 + 19391946.

It is an arithmetic number, because the mean of its divisors is an integer number (19391946).

Almost surely, 2^38783891 is an apocalyptic number.

38783891 is a deficient number, since it is larger than the sum of its proper divisors (1).

38783891 is an equidigital number, since it uses as much as digits as its factorization.

38783891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 38783891 is about 6227.6713946707. The cubic root of 38783891 is about 338.4935980002.

The spelling of 38783891 in words is "thirty-eight million, seven hundred eighty-three thousand, eight hundred ninety-one".