381861609 has 8 divisors (see below), whose sum is σ = 516748320. Its totient is φ = 250774656.

The previous prime is 381861581. The next prime is 381861631. The reversal of 381861609 is 906168183.

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

It is not a de Polignac number, because 381861609 - 2²⁷ = 247643881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381861509) 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 7 ways as a sum of consecutive naturals, for example, 949704 + ... + 950105.

It is an arithmetic number, because the mean of its divisors is an integer number (64593540).

Almost surely, 2^381861609 is an apocalyptic number.

It is an amenable number.

381861609 is a deficient number, since it is larger than the sum of its proper divisors (134886711).

381861609 is a wasteful number, since it uses less digits than its factorization.

381861609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899879.

The product of its (nonzero) digits is 62208, while the sum is 42.

The square root of 381861609 is about 19541.2796152146. The cubic root of 381861609 is about 725.4965185404.

The spelling of 381861609 in words is "three hundred eighty-one million, eight hundred sixty-one thousand, six hundred nine".