387665856 has 84 divisors (see below), whose sum is σ = 1116406200. Its totient is φ = 128613888.

The previous prime is 387665821. The next prime is 387665867. The reversal of 387665856 is 658566783.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 130435 + ... + 133373.

It is an arithmetic number, because the mean of its divisors is an integer number (13290550).

Almost surely, 2^387665856 is an apocalyptic number.

387665856 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 387665856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558203100).

387665856 is an abundant number, since it is smaller than the sum of its proper divisors (728740344).

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

387665856 is a wasteful number, since it uses less digits than its factorization.

387665856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3186 (or 3173 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 387665856 is about 19689.2319809585. The cubic root of 387665856 is about 729.1538679542.

It can be divided in two parts, 387665 and 856, that added together give a triangular number (388521 = T₈₈₁).

The spelling of 387665856 in words is "three hundred eighty-seven million, six hundred sixty-five thousand, eight hundred fifty-six".