38745781 has 2 divisors, whose sum is σ = 38745782. Its totient is φ = 38745780.

The previous prime is 38745767. The next prime is 38745799. The reversal of 38745781 is 18754783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33246756 + 5499025 = 5766^2 + 2345^2 .

It is a cyclic number.

It is not a de Polignac number, because 38745781 - 2²⁵ = 5191349 is a prime.

It is a super-2 number, since 2×38745781² = 3002471090599922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38745761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19372890 + 19372891.

It is an arithmetic number, because the mean of its divisors is an integer number (19372891).

Almost surely, 2^38745781 is an apocalyptic number.

It is an amenable number.

38745781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38745781 is an equidigital number, since it uses as much as digits as its factorization.

38745781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 38745781 is about 6224.6109115350. The cubic root of 38745781 is about 338.3826909692.

The spelling of 38745781 in words is "thirty-eight million, seven hundred forty-five thousand, seven hundred eighty-one".