381187879 has 4 divisors (see below), whose sum is σ = 381419584. Its totient is φ = 380956176.

The previous prime is 381187843. The next prime is 381187897. The reversal of 381187879 is 978781183.

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

It is a cyclic number.

It is not a de Polignac number, because 381187879 - 2²¹ = 379090727 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 (381184879) 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, 113367 + ... + 116680.

It is an arithmetic number, because the mean of its divisors is an integer number (95354896).

Almost surely, 2^381187879 is an apocalyptic number.

381187879 is a deficient number, since it is larger than the sum of its proper divisors (231705).

381187879 is a wasteful number, since it uses less digits than its factorization.

381187879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231704.

The product of its digits is 677376, while the sum is 52.

The square root of 381187879 is about 19524.0333691581. The cubic root of 381187879 is about 725.0695955386.

The spelling of 381187879 in words is "three hundred eighty-one million, one hundred eighty-seven thousand, eight hundred seventy-nine".