38869981 has 2 divisors, whose sum is σ = 38869982. Its totient is φ = 38869980.

The previous prime is 38869969. The next prime is 38870003. The reversal of 38869981 is 18996883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38862756 + 7225 = 6234^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 38869981 - 2²¹ = 36772829 is a prime.

It is a super-2 number, since 2×38869981² = 3021750845880722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38869081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19434990 + 19434991.

It is an arithmetic number, because the mean of its divisors is an integer number (19434991).

Almost surely, 2^38869981 is an apocalyptic number.

It is an amenable number.

38869981 is a deficient number, since it is larger than the sum of its proper divisors (1).

38869981 is an equidigital number, since it uses as much as digits as its factorization.

38869981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 52.

The square root of 38869981 is about 6234.5794565472. The cubic root of 38869981 is about 338.7438683912.

The spelling of 38869981 in words is "thirty-eight million, eight hundred sixty-nine thousand, nine hundred eighty-one".