381993807 has 8 divisors (see below), whose sum is σ = 548503984. Its totient is φ = 235073088.

The previous prime is 381993707. The next prime is 381993839. The reversal of 381993807 is 708399183.

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

It is a de Polignac number, because none of the positive numbers 2^k-381993807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381993847) 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, 4897318 + ... + 4897395.

It is an arithmetic number, because the mean of its divisors is an integer number (68562998).

Almost surely, 2^381993807 is an apocalyptic number.

381993807 is a deficient number, since it is larger than the sum of its proper divisors (166510177).

381993807 is a wasteful number, since it uses less digits than its factorization.

381993807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9794729.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 381993807 is about 19544.6618543274. The cubic root of 381993807 is about 725.5802296030.

The spelling of 381993807 in words is "three hundred eighty-one million, nine hundred ninety-three thousand, eight hundred seven".