385749891 has 16 divisors (see below), whose sum is σ = 577376800. Its totient is φ = 254513664.

The previous prime is 385749863. The next prime is 385749911. The reversal of 385749891 is 198947583.

It is a de Polignac number, because none of the positive numbers 2^k-385749891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385749841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71026 + ... + 76263.

It is an arithmetic number, because the mean of its divisors is an integer number (36086050).

Almost surely, 2^385749891 is an apocalyptic number.

385749891 is a deficient number, since it is larger than the sum of its proper divisors (191626909).

385749891 is a wasteful number, since it uses less digits than its factorization.

385749891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147395 (or 147389 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 54.

The square root of 385749891 is about 19640.5165665265. The cubic root of 385749891 is about 727.9506486239.

The spelling of 385749891 in words is "three hundred eighty-five million, seven hundred forty-nine thousand, eight hundred ninety-one".