385257816 has 32 divisors (see below), whose sum is σ = 1070161200. Its totient is φ = 128419200.

The previous prime is 385257709. The next prime is 385257823. The reversal of 385257816 is 618752583.

385257816 is a `hidden beast` number, since 385 + 257 + 8 + 16 = 666.

385257816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891585 + ... + 892016.

Almost surely, 2^385257816 is an apocalyptic number.

385257816 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

385257816 is an abundant number, since it is smaller than the sum of its proper divisors (684903384).

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

385257816 is a wasteful number, since it uses less digits than its factorization.

385257816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783616 (or 1783606 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 385257816 is about 19627.9855308689. The cubic root of 385257816 is about 727.6409844736.

The spelling of 385257816 in words is "three hundred eighty-five million, two hundred fifty-seven thousand, eight hundred sixteen".