38878661 has 2 divisors, whose sum is σ = 38878662. Its totient is φ = 38878660.

The previous prime is 38878657. The next prime is 38878687. The reversal of 38878661 is 16687883.

38878661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32273761 + 6604900 = 5681^2 + 2570^2 .

It is a cyclic number.

It is not a de Polignac number, because 38878661 - 2² = 38878657 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38878261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19439330 + 19439331.

It is an arithmetic number, because the mean of its divisors is an integer number (19439331).

Almost surely, 2^38878661 is an apocalyptic number.

38878661 is the 2789-th centered decagonal number.

It is an amenable number.

38878661 is a deficient number, since it is larger than the sum of its proper divisors (1).

38878661 is an equidigital number, since it uses as much as digits as its factorization.

38878661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 38878661 is about 6235.2755352109. The cubic root of 38878661 is about 338.7690813178.

The spelling of 38878661 in words is "thirty-eight million, eight hundred seventy-eight thousand, six hundred sixty-one".