38218081 has 4 divisors (see below), whose sum is σ = 41692464. Its totient is φ = 34743700.

The previous prime is 38218049. The next prime is 38218087. The reversal of 38218081 is 18081283.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 38218081 - 2⁵ = 38218049 is a prime.

It is a super-2 number, since 2×38218081² = 2921243430645122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (38218087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1737175 + ... + 1737196.

It is an arithmetic number, because the mean of its divisors is an integer number (10423116).

Almost surely, 2^38218081 is an apocalyptic number.

It is an amenable number.

38218081 is a deficient number, since it is larger than the sum of its proper divisors (3474383).

38218081 is a wasteful number, since it uses less digits than its factorization.

38218081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3474382.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 38218081 is about 6182.0774016507. The cubic root of 38218081 is about 336.8394572070.

The spelling of 38218081 in words is "thirty-eight million, two hundred eighteen thousand, eighty-one".