38408821 has 4 divisors (see below), whose sum is σ = 41900544. Its totient is φ = 34917100.

The previous prime is 38408819. The next prime is 38408857. The reversal of 38408821 is 12880483.

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 38408821 - 2¹ = 38408819 is a prime.

It is a super-2 number, since 2×38408821² = 2950475061220082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38408891) 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, 1745845 + ... + 1745866.

It is an arithmetic number, because the mean of its divisors is an integer number (10475136).

Almost surely, 2^38408821 is an apocalyptic number.

It is an amenable number.

38408821 is a deficient number, since it is larger than the sum of its proper divisors (3491723).

38408821 is a wasteful number, since it uses less digits than its factorization.

38408821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491722.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 38408821 is about 6197.4850544394. The cubic root of 38408821 is about 337.3988971968.

The spelling of 38408821 in words is "thirty-eight million, four hundred eight thousand, eight hundred twenty-one".