380408821 has 4 divisors (see below), whose sum is σ = 409671052. Its totient is φ = 351146592.

The previous prime is 380408761. The next prime is 380408827. The reversal of 380408821 is 128804083.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150552900 + 229855921 = 12270^2 + 15161^2 .

It is a cyclic number.

It is not a de Polignac number, because 380408821 - 2⁹ = 380408309 is a prime.

It is a super-2 number, since 2×380408821² = 289421742189220082, 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 (380408827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14631096 + ... + 14631121.

It is an arithmetic number, because the mean of its divisors is an integer number (102417763).

Almost surely, 2^380408821 is an apocalyptic number.

It is an amenable number.

380408821 is a deficient number, since it is larger than the sum of its proper divisors (29262231).

380408821 is a wasteful number, since it uses less digits than its factorization.

380408821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29262230.

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

The square root of 380408821 is about 19504.0719081939. The cubic root of 380408821 is about 724.5753016407.

The spelling of 380408821 in words is "three hundred eighty million, four hundred eight thousand, eight hundred twenty-one".