38615861 has 2 divisors, whose sum is σ = 38615862. Its totient is φ = 38615860.

The previous prime is 38615783. The next prime is 38615869. The reversal of 38615861 is 16851683.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33709636 + 4906225 = 5806^2 + 2215^2 .

It is an emirp because it is prime and its reverse (16851683) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38615861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38615869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19307930 + 19307931.

It is an arithmetic number, because the mean of its divisors is an integer number (19307931).

Almost surely, 2^38615861 is an apocalyptic number.

It is an amenable number.

38615861 is a deficient number, since it is larger than the sum of its proper divisors (1).

38615861 is an equidigital number, since it uses as much as digits as its factorization.

38615861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 38.

The square root of 38615861 is about 6214.1661548433. The cubic root of 38615861 is about 338.0040526807.

The spelling of 38615861 in words is "thirty-eight million, six hundred fifteen thousand, eight hundred sixty-one".