381578369 has 4 divisors (see below), whose sum is σ = 381911040. Its totient is φ = 381245700.

The previous prime is 381578357. The next prime is 381578423. The reversal of 381578369 is 963875183.

It is a happy number.

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: 963875183 = 6197 ⋅155539.

It is a cyclic number.

It is not a de Polignac number, because 381578369 - 2¹² = 381574273 is a prime.

It is a super-2 number, since 2×381578369² = 291204103377400322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381578339) 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, 164609 + ... + 166910.

It is an arithmetic number, because the mean of its divisors is an integer number (95477760).

Almost surely, 2^381578369 is an apocalyptic number.

It is an amenable number.

381578369 is a deficient number, since it is larger than the sum of its proper divisors (332671).

381578369 is a wasteful number, since it uses less digits than its factorization.

381578369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332670.

The product of its digits is 1088640, while the sum is 50.

The square root of 381578369 is about 19534.0310484037. The cubic root of 381578369 is about 725.3170988621.

The spelling of 381578369 in words is "three hundred eighty-one million, five hundred seventy-eight thousand, three hundred sixty-nine".