381916193 has 4 divisors (see below), whose sum is σ = 381976368. Its totient is φ = 381856020.

The previous prime is 381916123. The next prime is 381916231. The reversal of 381916193 is 391619183.

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.

It is a cyclic number.

It is not a de Polignac number, because 381916193 - 2²⁸ = 113480737 is a prime.

It is a super-2 number, since 2×381916193² = 291719956951226498, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381916193.

It is not an unprimeable number, because it can be changed into a prime (381916103) 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, 19271 + ... + 33692.

It is an arithmetic number, because the mean of its divisors is an integer number (95494092).

Almost surely, 2^381916193 is an apocalyptic number.

It is an amenable number.

381916193 is a deficient number, since it is larger than the sum of its proper divisors (60175).

381916193 is an equidigital number, since it uses as much as digits as its factorization.

381916193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60174.

The product of its digits is 34992, while the sum is 41.

The square root of 381916193 is about 19542.6761985149. The cubic root of 381916193 is about 725.5310848286.

The spelling of 381916193 in words is "three hundred eighty-one million, nine hundred sixteen thousand, one hundred ninety-three".