38209681 has 2 divisors, whose sum is σ = 38209682. Its totient is φ = 38209680.

The previous prime is 38209679. The next prime is 38209697. The reversal of 38209681 is 18690283.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35700625 + 2509056 = 5975^2 + 1584^2 .

It is a cyclic number.

It is not a de Polignac number, because 38209681 - 2¹ = 38209679 is a prime.

It is a super-2 number, since 2×38209681² = 2919959444243522, which contains 22 as substring.

Together with 38209679, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38209681.

It is not a weakly prime, because it can be changed into another prime (38209621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19104840 + 19104841.

It is an arithmetic number, because the mean of its divisors is an integer number (19104841).

Almost surely, 2^38209681 is an apocalyptic number.

It is an amenable number.

38209681 is a deficient number, since it is larger than the sum of its proper divisors (1).

38209681 is an equidigital number, since it uses as much as digits as its factorization.

38209681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 38209681 is about 6181.3979810396. The cubic root of 38209681 is about 336.8147772764.

The spelling of 38209681 in words is "thirty-eight million, two hundred nine thousand, six hundred eighty-one".