381256439 has 4 divisors (see below), whose sum is σ = 386626320. Its totient is φ = 375886560.

The previous prime is 381256411. The next prime is 381256453. The reversal of 381256439 is 934652183.

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 381256439 - 2¹⁶ = 381190903 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 381256396 and 381256405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381250439) 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, 2684834 + ... + 2684975.

It is an arithmetic number, because the mean of its divisors is an integer number (96656580).

Almost surely, 2^381256439 is an apocalyptic number.

381256439 is a deficient number, since it is larger than the sum of its proper divisors (5369881).

381256439 is an equidigital number, since it uses as much as digits as its factorization.

381256439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5369880.

The product of its digits is 155520, while the sum is 41.

The square root of 381256439 is about 19525.7890749644. The cubic root of 381256439 is about 725.1130629853.

The spelling of 381256439 in words is "three hundred eighty-one million, two hundred fifty-six thousand, four hundred thirty-nine".