385817940 has 72 divisors (see below), whose sum is σ = 1208083968. Its totient is φ = 99564480.

The previous prime is 385817891. The next prime is 385817963. The reversal of 385817940 is 49718583.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28992 + ... + 40151.

It is an arithmetic number, because the mean of its divisors is an integer number (16778944).

Almost surely, 2^385817940 is an apocalyptic number.

385817940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

385817940 is an abundant number, since it is smaller than the sum of its proper divisors (822266028).

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

385817940 is a wasteful number, since it uses less digits than its factorization.

385817940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69189 (or 69184 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 385817940 is about 19642.2488529191. The cubic root of 385817940 is about 727.9934513157.

The spelling of 385817940 in words is "three hundred eighty-five million, eight hundred seventeen thousand, nine hundred forty".