387521684 has 12 divisors (see below), whose sum is σ = 739814208. Its totient is φ = 176146200.

The previous prime is 387521677. The next prime is 387521689. The reversal of 387521684 is 486125783.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 8807311 = 387521684 / (3 + 8 + 7 + 5 + 2 + 1 + 6 + 8 + 4).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387521689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403612 + ... + 4403699.

It is an arithmetic number, because the mean of its divisors is an integer number (61651184).

Almost surely, 2^387521684 is an apocalyptic number.

It is an amenable number.

387521684 is a deficient number, since it is larger than the sum of its proper divisors (352292524).

387521684 is a wasteful number, since it uses less digits than its factorization.

387521684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8807326 (or 8807324 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 387521684 is about 19685.5704514754. The cubic root of 387521684 is about 729.0634665563.

The spelling of 387521684 in words is "three hundred eighty-seven million, five hundred twenty-one thousand, six hundred eighty-four".