387681844 has 12 divisors (see below), whose sum is σ = 740119968. Its totient is φ = 176219000.

The previous prime is 387681829. The next prime is 387681863. The reversal of 387681844 is 448186783.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4405432 + ... + 4405519.

It is an arithmetic number, because the mean of its divisors is an integer number (61676664).

Almost surely, 2^387681844 is an apocalyptic number.

It is an amenable number.

387681844 is a deficient number, since it is larger than the sum of its proper divisors (352438124).

387681844 is a wasteful number, since it uses less digits than its factorization.

387681844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8810966 (or 8810964 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 49.

The square root of 387681844 is about 19689.6379854989. The cubic root of 387681844 is about 729.1638916654.

The spelling of 387681844 in words is "three hundred eighty-seven million, six hundred eighty-one thousand, eight hundred forty-four".