381843919 has 4 divisors (see below), whose sum is σ = 404305344. Its totient is φ = 359382496.

The previous prime is 381843911. The next prime is 381843923. The reversal of 381843919 is 919348183.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 381843919 - 2³ = 381843911 is a prime.

It is a super-2 number, since 2×381843919² = 291609556954557122, 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 (381843911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11230687 + ... + 11230720.

It is an arithmetic number, because the mean of its divisors is an integer number (101076336).

Almost surely, 2^381843919 is an apocalyptic number.

381843919 is a deficient number, since it is larger than the sum of its proper divisors (22461425).

381843919 is a wasteful number, since it uses less digits than its factorization.

381843919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22461424.

The product of its digits is 186624, while the sum is 46.

The square root of 381843919 is about 19540.8269784060. The cubic root of 381843919 is about 725.4853153267.

The spelling of 381843919 in words is "three hundred eighty-one million, eight hundred forty-three thousand, nine hundred nineteen".