381488819 has 4 divisors (see below), whose sum is σ = 390360696. Its totient is φ = 372616944.

The previous prime is 381488777. The next prime is 381488831. The reversal of 381488819 is 918884183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 918884183 = 7 ⋅131269169.

It is a cyclic number.

It is not a de Polignac number, because 381488819 - 2⁸ = 381488563 is a prime.

It is a super-2 number, since 2×381488819² = 291067438044029522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381488839) 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, 4435874 + ... + 4435959.

It is an arithmetic number, because the mean of its divisors is an integer number (97590174).

Almost surely, 2^381488819 is an apocalyptic number.

381488819 is a deficient number, since it is larger than the sum of its proper divisors (8871877).

381488819 is an equidigital number, since it uses as much as digits as its factorization.

381488819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871876.

The product of its digits is 442368, while the sum is 50.

The square root of 381488819 is about 19531.7387602845. The cubic root of 381488819 is about 725.2603545310.

The spelling of 381488819 in words is "three hundred eighty-one million, four hundred eighty-eight thousand, eight hundred nineteen".