381989439 has 56 divisors (see below), whose sum is σ = 653334192. Its totient is φ = 221149440.

The previous prime is 381989431. The next prime is 381989441. The reversal of 381989439 is 934989183.

It is not a de Polignac number, because 381989439 - 2³ = 381989431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381989431) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 159924 + ... + 162294.

It is an arithmetic number, because the mean of its divisors is an integer number (11666682).

Almost surely, 2^381989439 is an apocalyptic number.

381989439 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

381989439 is a deficient number, since it is larger than the sum of its proper divisors (271344753).

381989439 is a wasteful number, since it uses less digits than its factorization.

381989439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2419 (or 2404 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 381989439 is about 19544.5501099411. The cubic root of 381989439 is about 725.5774639853.

The spelling of 381989439 in words is "three hundred eighty-one million, nine hundred eighty-nine thousand, four hundred thirty-nine".