381449816 has 16 divisors (see below), whose sum is σ = 780238440. Its totient is φ = 173386240.

The previous prime is 381449807. The next prime is 381449821. The reversal of 381449816 is 618944183.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2167241 + ... + 2167416.

Almost surely, 2^381449816 is an apocalyptic number.

It is an amenable number.

381449816 is an abundant number, since it is smaller than the sum of its proper divisors (398788624).

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

381449816 is a wasteful number, since it uses less digits than its factorization.

381449816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4334674 (or 4334670 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 381449816 is about 19530.7402829488. The cubic root of 381449816 is about 725.2356370799.

The spelling of 381449816 in words is "three hundred eighty-one million, four hundred forty-nine thousand, eight hundred sixteen".