381409512 has 128 divisors (see below), whose sum is σ = 1082419200. Its totient is φ = 110988800.

The previous prime is 381409499. The next prime is 381409519. The reversal of 381409512 is 215904183.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (381409519) 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 31 ways as a sum of consecutive naturals, for example, 731812 + ... + 732332.

It is an arithmetic number, because the mean of its divisors is an integer number (8456400).

Almost surely, 2^381409512 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 381409512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541209600).

381409512 is an abundant number, since it is smaller than the sum of its proper divisors (701009688).

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

381409512 is a wasteful number, since it uses less digits than its factorization.

381409512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 381409512 is about 19529.7084463645. The cubic root of 381409512 is about 725.2100933732.

The spelling of 381409512 in words is "three hundred eighty-one million, four hundred nine thousand, five hundred twelve".