385289381 has 4 divisors (see below), whose sum is σ = 390716064. Its totient is φ = 379862700.

The previous prime is 385289371. The next prime is 385289407. The reversal of 385289381 is 183982583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 183982583 = 29 ⋅6344227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385289381 is a prime.

It is a super-2 number, since 2×385289381² = 296895814222726322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (385289371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713235 + ... + 2713376.

It is an arithmetic number, because the mean of its divisors is an integer number (97679016).

Almost surely, 2^385289381 is an apocalyptic number.

It is an amenable number.

385289381 is a deficient number, since it is larger than the sum of its proper divisors (5426683).

385289381 is an equidigital number, since it uses as much as digits as its factorization.

385289381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426682.

The product of its digits is 414720, while the sum is 47.

The square root of 385289381 is about 19628.7895958971. The cubic root of 385289381 is about 727.6608563270.

The spelling of 385289381 in words is "three hundred eighty-five million, two hundred eighty-nine thousand, three hundred eighty-one".