385781992 has 16 divisors (see below), whose sum is σ = 723839040. Its totient is φ = 192758256.

The previous prime is 385781989. The next prime is 385782029. The reversal of 385781992 is 299187583.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3648 + ... + 28015.

It is an arithmetic number, because the mean of its divisors is an integer number (45239940).

Almost surely, 2^385781992 is an apocalyptic number.

It is an amenable number.

385781992 is a deficient number, since it is larger than the sum of its proper divisors (338057048).

385781992 is a wasteful number, since it uses less digits than its factorization.

385781992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33192 (or 33188 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 52.

The square root of 385781992 is about 19641.3337632657. Note that the first 3 decimals coincide. The cubic root of 385781992 is about 727.9708407191.

It can be divided in two parts, 3857 and 81992, that added together give a square (85849 = 293²).

The spelling of 385781992 in words is "three hundred eighty-five million, seven hundred eighty-one thousand, nine hundred ninety-two".