385981820 has 36 divisors (see below), whose sum is σ = 942900840. Its totient is φ = 132336288.

The previous prime is 385981819. The next prime is 385981847. The reversal of 385981820 is 28189583.

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, 195950 + ... + 197909.

It is an arithmetic number, because the mean of its divisors is an integer number (26191690).

Almost surely, 2^385981820 is an apocalyptic number.

It is an amenable number.

385981820 is an abundant number, since it is smaller than the sum of its proper divisors (556919020).

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

385981820 is a wasteful number, since it uses less digits than its factorization.

385981820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393882 (or 393873 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 44.

The square root of 385981820 is about 19646.4200301225. The cubic root of 385981820 is about 728.0965108736.

The spelling of 385981820 in words is "three hundred eighty-five million, nine hundred eighty-one thousand, eight hundred twenty".