381804018 has 8 divisors (see below), whose sum is σ = 763608048. Its totient is φ = 127268004.

The previous prime is 381804011. The next prime is 381804023. The reversal of 381804018 is 810408183.

It is a happy number.

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

381804018 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 381804018.

It is not an unprimeable number, because it can be changed into a prime (381804011) 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, 31816996 + ... + 31817007.

It is an arithmetic number, because the mean of its divisors is an integer number (95451006).

Almost surely, 2^381804018 is an apocalyptic number.

381804018 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381804018 is a wasteful number, since it uses less digits than its factorization.

381804018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63634008.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 381804018 is about 19539.8059867543. The cubic root of 381804018 is about 725.4600444447.

The spelling of 381804018 in words is "three hundred eighty-one million, eight hundred four thousand, eighteen".