38413821 has 4 divisors (see below), whose sum is σ = 51218432. Its totient is φ = 25609212.

The previous prime is 38413819. The next prime is 38413831. The reversal of 38413821 is 12831483.

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 not a de Polignac number, because 38413821 - 2¹ = 38413819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38413831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402301 + ... + 6402306.

It is an arithmetic number, because the mean of its divisors is an integer number (12804608).

Almost surely, 2^38413821 is an apocalyptic number.

It is an amenable number.

38413821 is a deficient number, since it is larger than the sum of its proper divisors (12804611).

38413821 is a wasteful number, since it uses less digits than its factorization.

38413821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804610.

The product of its digits is 4608, while the sum is 30.

The square root of 38413821 is about 6197.8884307480. Note that the first 3 decimals coincide. The cubic root of 38413821 is about 337.4135372478.

The spelling of 38413821 in words is "thirty-eight million, four hundred thirteen thousand, eight hundred twenty-one".