381607891 has 8 divisors (see below), whose sum is σ = 461777760. Its totient is φ = 307851648.

The previous prime is 381607871. The next prime is 381607901. The reversal of 381607891 is 198706183.

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

It is a cyclic number.

It is not a de Polignac number, because 381607891 - 2¹⁷ = 381476819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381607871) 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, 1603276 + ... + 1603513.

It is an arithmetic number, because the mean of its divisors is an integer number (57722220).

Almost surely, 2^381607891 is an apocalyptic number.

381607891 is a deficient number, since it is larger than the sum of its proper divisors (80169869).

381607891 is a wasteful number, since it uses less digits than its factorization.

381607891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3206813.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 381607891 is about 19534.7866893908. The cubic root of 381607891 is about 725.3358038525.

The spelling of 381607891 in words is "three hundred eighty-one million, six hundred seven thousand, eight hundred ninety-one".