38618866 has 64 divisors (see below), whose sum is σ = 74027520. Its totient is φ = 14926080.

The previous prime is 38618813. The next prime is 38618873. The reversal of 38618866 is 66881683.

It is a happy number.

38618866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

38618866 is a nontrivial binomial coefficient, being equal to C(8789, 2).

It is a super-2 number, since 2×38618866² = 2982833622251912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 821655 + ... + 821701.

It is an arithmetic number, because the mean of its divisors is an integer number (1156680).

Almost surely, 2^38618866 is an apocalyptic number.

38618866 is the 8788-th triangular number.

38618866 is the 2930-th centered nonagonal number.

38618866 is a deficient number, since it is larger than the sum of its proper divisors (35408654).

38618866 is a wasteful number, since it uses less digits than its factorization.

38618866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116 (or 90 counting only the distinct ones).

The product of its digits is 331776, while the sum is 46.

The square root of 38618866 is about 6214.4079364007. The cubic root of 38618866 is about 338.0128200266.

The spelling of 38618866 in words is "thirty-eight million, six hundred eighteen thousand, eight hundred sixty-six".