381869977 has 4 divisors (see below), whose sum is σ = 382147876. Its totient is φ = 381592080.

The previous prime is 381869927. The next prime is 381870029. The reversal of 381869977 is 779968183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 249987721 + 131882256 = 15811^2 + 11484^2 .

It is a cyclic number.

It is not a de Polignac number, because 381869977 - 2¹¹ = 381867929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381869927) 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 3 ways as a sum of consecutive naturals, for example, 136878 + ... + 139639.

It is an arithmetic number, because the mean of its divisors is an integer number (95536969).

Almost surely, 2^381869977 is an apocalyptic number.

It is an amenable number.

381869977 is a deficient number, since it is larger than the sum of its proper divisors (277899).

381869977 is a wasteful number, since it uses less digits than its factorization.

381869977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277898.

The product of its digits is 4572288, while the sum is 58.

The square root of 381869977 is about 19541.4937248922. The cubic root of 381869977 is about 725.5018179389.

The spelling of 381869977 in words is "three hundred eighty-one million, eight hundred sixty-nine thousand, nine hundred seventy-seven".