38905819 has 2 divisors, whose sum is σ = 38905820. Its totient is φ = 38905818.

The previous prime is 38905793. The next prime is 38905831. The reversal of 38905819 is 91850983.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38905819 is a prime.

It is a super-2 number, since 2×38905819² = 3027325504121522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38905859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19452909 + 19452910.

It is an arithmetic number, because the mean of its divisors is an integer number (19452910).

Almost surely, 2^38905819 is an apocalyptic number.

38905819 is a deficient number, since it is larger than the sum of its proper divisors (1).

38905819 is an equidigital number, since it uses as much as digits as its factorization.

38905819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 38905819 is about 6237.4529256741. The cubic root of 38905819 is about 338.8479433385.

The spelling of 38905819 in words is "thirty-eight million, nine hundred five thousand, eight hundred nineteen".