381549825 has 24 divisors (see below), whose sum is σ = 700922400. Its totient is φ = 203492880.

The previous prime is 381549803. The next prime is 381549827. The reversal of 381549825 is 528945183.

381549825 is a `hidden beast` number, since 3 + 81 + 549 + 8 + 25 = 666.

It is not a de Polignac number, because 381549825 - 2⁸ = 381549569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (381549827) 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 23 ways as a sum of consecutive naturals, for example, 281955 + ... + 283304.

It is an arithmetic number, because the mean of its divisors is an integer number (29205100).

Almost surely, 2^381549825 is an apocalyptic number.

It is an amenable number.

381549825 is a deficient number, since it is larger than the sum of its proper divisors (319372575).

381549825 is a wasteful number, since it uses less digits than its factorization.

381549825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565278 (or 565267 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 381549825 is about 19533.3004123727. The cubic root of 381549825 is about 725.2990126102.

The spelling of 381549825 in words is "three hundred eighty-one million, five hundred forty-nine thousand, eight hundred twenty-five".