38859781 has 2 divisors, whose sum is σ = 38859782. Its totient is φ = 38859780.

The previous prime is 38859749. The next prime is 38859787. The reversal of 38859781 is 18795883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29062881 + 9796900 = 5391^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 38859781 - 2⁵ = 38859749 is a prime.

It is a super-2 number, since 2×38859781² = 3020165158735922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38859787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19429890 + 19429891.

It is an arithmetic number, because the mean of its divisors is an integer number (19429891).

Almost surely, 2^38859781 is an apocalyptic number.

It is an amenable number.

38859781 is a deficient number, since it is larger than the sum of its proper divisors (1).

38859781 is an equidigital number, since it uses as much as digits as its factorization.

38859781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 49.

The square root of 38859781 is about 6233.7613845896. The cubic root of 38859781 is about 338.7142355002.

The spelling of 38859781 in words is "thirty-eight million, eight hundred fifty-nine thousand, seven hundred eighty-one".