38813821 has 8 divisors (see below), whose sum is σ = 39943904. Its totient is φ = 37694160.

The previous prime is 38813791. The next prime is 38813833. The reversal of 38813821 is 12831883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 38813821 - 2⁹ = 38813309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38813221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5290 + ... + 10276.

It is an arithmetic number, because the mean of its divisors is an integer number (4992988).

Almost surely, 2^38813821 is an apocalyptic number.

It is an amenable number.

38813821 is a deficient number, since it is larger than the sum of its proper divisors (1130083).

38813821 is a wasteful number, since it uses less digits than its factorization.

38813821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5211.

The product of its digits is 9216, while the sum is 34.

The square root of 38813821 is about 6230.0739160944. The cubic root of 38813821 is about 338.5806488190.

The spelling of 38813821 in words is "thirty-eight million, eight hundred thirteen thousand, eight hundred twenty-one".