381831869 has 4 divisors (see below), whose sum is σ = 381954720. Its totient is φ = 381709020.

The previous prime is 381831851. The next prime is 381831871. The reversal of 381831869 is 968138183.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381831869 - 2⁸ = 381831613 is a prime.

It is a super-2 number, since 2×381831869² = 291591152368066322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381833869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56639 + ... + 63020.

It is an arithmetic number, because the mean of its divisors is an integer number (95488680).

Almost surely, 2^381831869 is an apocalyptic number.

It is an amenable number.

381831869 is a deficient number, since it is larger than the sum of its proper divisors (122851).

381831869 is a wasteful number, since it uses less digits than its factorization.

381831869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122850.

The product of its digits is 248832, while the sum is 47.

The square root of 381831869 is about 19540.5186471598. The cubic root of 381831869 is about 725.4776837705.

The spelling of 381831869 in words is "three hundred eighty-one million, eight hundred thirty-one thousand, eight hundred sixty-nine".