381393919 has 2 divisors, whose sum is σ = 381393920. Its totient is φ = 381393918.

The previous prime is 381393863. The next prime is 381393923. The reversal of 381393919 is 919393183.

It is a strong prime.

It is an emirp because it is prime and its reverse (919393183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381393919 - 2⁷ = 381393791 is a prime.

It is a super-2 number, since 2×381393919² = 290922642900357122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (381393979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190696959 + 190696960.

It is an arithmetic number, because the mean of its divisors is an integer number (190696960).

Almost surely, 2^381393919 is an apocalyptic number.

381393919 is a deficient number, since it is larger than the sum of its proper divisors (1).

381393919 is an equidigital number, since it uses as much as digits as its factorization.

381393919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 157464, while the sum is 46.

The square root of 381393919 is about 19529.3092299753. The cubic root of 381393919 is about 725.2002104218.

The spelling of 381393919 in words is "three hundred eighty-one million, three hundred ninety-three thousand, nine hundred nineteen".