381438331 has 4 divisors (see below), whose sum is σ = 381478464. Its totient is φ = 381398200.

The previous prime is 381438329. The next prime is 381438347. The reversal of 381438331 is 133834183.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 381438331 - 2¹ = 381438329 is a prime.

It is a super-2 number, since 2×381438331² = 290990400712131122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381438301) 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, 3126 + ... + 27796.

It is an arithmetic number, because the mean of its divisors is an integer number (95369616).

Almost surely, 2^381438331 is an apocalyptic number.

381438331 is a deficient number, since it is larger than the sum of its proper divisors (40133).

381438331 is a wasteful number, since it uses less digits than its factorization.

381438331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40132.

The product of its digits is 20736, while the sum is 34.

The square root of 381438331 is about 19530.4462570623. The cubic root of 381438331 is about 725.2283583462.

The spelling of 381438331 in words is "three hundred eighty-one million, four hundred thirty-eight thousand, three hundred thirty-one".