38021818 has 4 divisors (see below), whose sum is σ = 57032730. Its totient is φ = 19010908.

The previous prime is 38021807. The next prime is 38021821. The reversal of 38021818 is 81812083.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81812083 = 853 ⋅95911.

It can be written as a sum of positive squares in only one way, i.e., 37859409 + 162409 = 6153^2 + 403^2 .

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 a self number, because there is not a number n which added to its sum of digits gives 38021818.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 9505453 + ... + 9505456.

Almost surely, 2^38021818 is an apocalyptic number.

38021818 is a deficient number, since it is larger than the sum of its proper divisors (19010912).

38021818 is a wasteful number, since it uses less digits than its factorization.

38021818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19010911.

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

The square root of 38021818 is about 6166.1834225070. The cubic root of 38021818 is about 336.2618718601.

The spelling of 38021818 in words is "thirty-eight million, twenty-one thousand, eight hundred eighteen".