385491813 has 16 divisors (see below), whose sum is σ = 621970560. Its totient is φ = 207323136.

The previous prime is 385491811. The next prime is 385491853. The reversal of 385491813 is 318194583.

It is not a de Polignac number, because 385491813 - 2¹ = 385491811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385491811) 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, 539548 + ... + 540261.

It is an arithmetic number, because the mean of its divisors is an integer number (38873160).

Almost surely, 2^385491813 is an apocalyptic number.

It is an amenable number.

385491813 is a deficient number, since it is larger than the sum of its proper divisors (236478747).

385491813 is a wasteful number, since it uses less digits than its factorization.

385491813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079836.

The product of its digits is 103680, while the sum is 42.

The square root of 385491813 is about 19633.9454262255. The cubic root of 385491813 is about 727.7882722898.

The spelling of 385491813 in words is "three hundred eighty-five million, four hundred ninety-one thousand, eight hundred thirteen".