381197385 has 12 divisors (see below), whose sum is σ = 660742212. Its totient is φ = 203305248.

The previous prime is 381197381. The next prime is 381197387. The reversal of 381197385 is 583791183.

381197385 is a `hidden beast` number, since 3 + 81 + 197 + 385 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 109244304 + 271953081 = 10452^2 + 16491^2 .

It is not a de Polignac number, because 381197385 - 2² = 381197381 is a prime.

It is a super-2 number, since 2×381197385² = 290622892661676450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 8471053 = 381197385 / (3 + 8 + 1 + 1 + 9 + 7 + 3 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 381197385.

It is not an unprimeable number, because it can be changed into a prime (381197381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4235482 + ... + 4235571.

It is an arithmetic number, because the mean of its divisors is an integer number (55061851).

Almost surely, 2^381197385 is an apocalyptic number.

It is an amenable number.

381197385 is a deficient number, since it is larger than the sum of its proper divisors (279544827).

381197385 is a wasteful number, since it uses less digits than its factorization.

381197385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8471064 (or 8471061 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 381197385 is about 19524.2768111907. The cubic root of 381197385 is about 725.0756227102.

The spelling of 381197385 in words is "three hundred eighty-one million, one hundred ninety-seven thousand, three hundred eighty-five".