381255709 has 4 divisors (see below), whose sum is σ = 385030620. Its totient is φ = 377480800.

The previous prime is 381255671. The next prime is 381255727. The reversal of 381255709 is 907552183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907552183 = 6779 ⋅133877.

It can be written as a sum of positive squares in 2 ways, for example, as 354267684 + 26988025 = 18822^2 + 5195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-381255709 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381255509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1887304 + ... + 1887505.

It is an arithmetic number, because the mean of its divisors is an integer number (96257655).

Almost surely, 2^381255709 is an apocalyptic number.

It is an amenable number.

381255709 is a deficient number, since it is larger than the sum of its proper divisors (3774911).

381255709 is a wasteful number, since it uses less digits than its factorization.

381255709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3774910.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 381255709 is about 19525.7703817289. The cubic root of 381255709 is about 725.1126001885.

It can be divided in two parts, 38125 and 5709, that added together give a palindrome (43834).

The spelling of 381255709 in words is "three hundred eighty-one million, two hundred fifty-five thousand, seven hundred nine".