381991456 has 72 divisors (see below), whose sum is σ = 954401616. Its totient is φ = 148821120.

The previous prime is 381991453. The next prime is 381991459. The reversal of 381991456 is 654199183.

It is an interprime number because it is at equal distance from previous prime (381991453) and next prime (381991459).

It is not an unprimeable number, because it can be changed into a prime (381991453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6175 + ... + 28321.

It is an arithmetic number, because the mean of its divisors is an integer number (13255578).

Almost surely, 2^381991456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381991456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (477200808).

381991456 is an abundant number, since it is smaller than the sum of its proper divisors (572410160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381991456 is a wasteful number, since it uses less digits than its factorization.

381991456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22182 (or 22167 counting only the distinct ones).

The product of its digits is 233280, while the sum is 46.

The square root of 381991456 is about 19544.6017099352. The cubic root of 381991456 is about 725.5787410600.

The spelling of 381991456 in words is "three hundred eighty-one million, nine hundred ninety-one thousand, four hundred fifty-six".