38663906 has 4 divisors (see below), whose sum is σ = 57995862. Its totient is φ = 19331952.

The previous prime is 38663843. The next prime is 38663957. The reversal of 38663906 is 60936683.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60936683 = 23 ⋅2649421.

It can be written as a sum of positive squares in only one way, i.e., 38551681 + 112225 = 6209^2 + 335^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9665975 + ... + 9665978.

Almost surely, 2^38663906 is an apocalyptic number.

38663906 is a deficient number, since it is larger than the sum of its proper divisors (19331956).

38663906 is a wasteful number, since it uses less digits than its factorization.

38663906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19331955.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 38663906 is about 6218.0307171966. The cubic root of 38663906 is about 338.1441736399.

The spelling of 38663906 in words is "thirty-eight million, six hundred sixty-three thousand, nine hundred six".