387686820 has 48 divisors (see below), whose sum is σ = 1091180160. Its totient is φ = 102844416.

The previous prime is 387686809. The next prime is 387686843. The reversal of 387686820 is 28686783.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 387686820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5160 + ... + 28319.

It is an arithmetic number, because the mean of its divisors is an integer number (22732920).

Almost surely, 2^387686820 is an apocalyptic number.

387686820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

387686820 is an abundant number, since it is smaller than the sum of its proper divisors (703493340).

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

387686820 is a wasteful number, since it uses less digits than its factorization.

387686820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33684 (or 33682 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 48.

The square root of 387686820 is about 19689.7643459743. The cubic root of 387686820 is about 729.1670113232.

The spelling of 387686820 in words is "three hundred eighty-seven million, six hundred eighty-six thousand, eight hundred twenty".