381320919 has 32 divisors (see below), whose sum is σ = 655280640. Its totient is φ = 214638336.

The previous prime is 381320909. The next prime is 381320921. The reversal of 381320919 is 919023183.

It is not a de Polignac number, because 381320919 - 2⁴ = 381320903 is a prime.

It is a super-2 number, since 2×381320919² = 290811286534009122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381320909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2394 + ... + 27719.

It is an arithmetic number, because the mean of its divisors is an integer number (20477520).

Almost surely, 2^381320919 is an apocalyptic number.

381320919 is a deficient number, since it is larger than the sum of its proper divisors (273959721).

381320919 is a wasteful number, since it uses less digits than its factorization.

381320919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30196 (or 30190 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 381320919 is about 19527.4401548180. The cubic root of 381320919 is about 725.1539389330.

The spelling of 381320919 in words is "three hundred eighty-one million, three hundred twenty thousand, nine hundred nineteen".