381304891 has 8 divisors (see below), whose sum is σ = 416142000. Its totient is φ = 346496640.

The previous prime is 381304877. The next prime is 381304907. The reversal of 381304891 is 198403183.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381304891 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 381304891.

It is not an unprimeable number, because it can be changed into a prime (381304811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27855 + ... + 39223.

It is an arithmetic number, because the mean of its divisors is an integer number (52017750).

Almost surely, 2^381304891 is an apocalyptic number.

381304891 is a deficient number, since it is larger than the sum of its proper divisors (34837109).

381304891 is a wasteful number, since it uses less digits than its factorization.

381304891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14429.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 381304891 is about 19527.0297536517. The cubic root of 381304891 is about 725.1437786982.

The spelling of 381304891 in words is "three hundred eighty-one million, three hundred four thousand, eight hundred ninety-one".