381799999 has 16 divisors (see below), whose sum is σ = 451676160. Its totient is φ = 315816480.

The previous prime is 381799997. The next prime is 381800017. The reversal of 381799999 is 999997183.

It is not a de Polignac number, because 381799999 - 2¹ = 381799997 is a prime.

It is a Duffinian number.

381799999 is a modest number, since divided by 99999 gives 3817 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 381799999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381799997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82152 + ... + 86674.

It is an arithmetic number, because the mean of its divisors is an integer number (28229760).

Almost surely, 2^381799999 is an apocalyptic number.

381799999 is a deficient number, since it is larger than the sum of its proper divisors (69876161).

381799999 is a wasteful number, since it uses less digits than its factorization.

381799999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4950.

The product of its digits is 9920232, while the sum is 64.

The square root of 381799999 is about 19539.7031451350. The cubic root of 381799999 is about 725.4574989554.

It can be divided in two parts, 3817 and 99999, that multiplied together give a palindrome (381696183).

The spelling of 381799999 in words is "three hundred eighty-one million, seven hundred ninety-nine thousand, nine hundred ninety-nine".