38139866 has 4 divisors (see below), whose sum is σ = 57209802. Its totient is φ = 19069932.

The previous prime is 38139847. The next prime is 38139869. The reversal of 38139866 is 66893183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 27867841 + 10272025 = 5279^2 + 3205^2 .

It is not an unprimeable number, because it can be changed into a prime (38139869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9534965 + ... + 9534968.

Almost surely, 2^38139866 is an apocalyptic number.

38139866 is a deficient number, since it is larger than the sum of its proper divisors (19069936).

38139866 is a wasteful number, since it uses less digits than its factorization.

38139866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19069935.

The product of its digits is 186624, while the sum is 44.

The square root of 38139866 is about 6175.7482137794. The cubic root of 38139866 is about 336.6095146371.

The spelling of 38139866 in words is "thirty-eight million, one hundred thirty-nine thousand, eight hundred sixty-six".