380181821 has 4 divisors (see below), whose sum is σ = 380976000. Its totient is φ = 379387644.

The previous prime is 380181817. The next prime is 380181839. The reversal of 380181821 is 128181083.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128181083 = 53 ⋅2418511.

It is a cyclic number.

It is not a de Polignac number, because 380181821 - 2² = 380181817 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 (380181721) 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, 396371 + ... + 397328.

It is an arithmetic number, because the mean of its divisors is an integer number (95244000).

Almost surely, 2^380181821 is an apocalyptic number.

It is an amenable number.

380181821 is a deficient number, since it is larger than the sum of its proper divisors (794179).

380181821 is an equidigital number, since it uses as much as digits as its factorization.

380181821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794178.

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 380181821 is about 19498.2517421434. The cubic root of 380181821 is about 724.4311485511.

The spelling of 380181821 in words is "three hundred eighty million, one hundred eighty-one thousand, eight hundred twenty-one".