38642866 has 4 divisors (see below), whose sum is σ = 57964302. Its totient is φ = 19321432.

The previous prime is 38642861. The next prime is 38642893. The reversal of 38642866 is 66824683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66824683 = 23 ⋅2905421.

It can be written as a sum of positive squares in only one way, i.e., 38626225 + 16641 = 6215^2 + 129^2 .

It is not an unprimeable number, because it can be changed into a prime (38642861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9660715 + ... + 9660718.

Almost surely, 2^38642866 is an apocalyptic number.

38642866 is a deficient number, since it is larger than the sum of its proper divisors (19321436).

38642866 is a wasteful number, since it uses less digits than its factorization.

38642866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19321435.

The product of its digits is 331776, while the sum is 43.

The square root of 38642866 is about 6216.3386329897. The cubic root of 38642866 is about 338.0828257743.

The spelling of 38642866 in words is "thirty-eight million, six hundred forty-two thousand, eight hundred sixty-six".