38965781 has 2 divisors, whose sum is σ = 38965782. Its totient is φ = 38965780.

The previous prime is 38965769. The next prime is 38965811. The reversal of 38965781 is 18756983.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38812900 + 152881 = 6230^2 + 391^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38965781 is a prime.

It is a super-2 number, since 2×38965781² = 3036664177879922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38965711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19482890 + 19482891.

It is an arithmetic number, because the mean of its divisors is an integer number (19482891).

Almost surely, 2^38965781 is an apocalyptic number.

It is an amenable number.

38965781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38965781 is an equidigital number, since it uses as much as digits as its factorization.

38965781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 38965781 is about 6242.2576845241. The cubic root of 38965781 is about 339.0219324892.

The spelling of 38965781 in words is "thirty-eight million, nine hundred sixty-five thousand, seven hundred eighty-one".