381138984 has 24 divisors (see below), whose sum is σ = 1032251610. Its totient is φ = 127046304.

The previous prime is 381138977. The next prime is 381138991. The reversal of 381138984 is 489831183.

It is an interprime number because it is at equal distance from previous prime (381138977) and next prime (381138991).

It can be written as a sum of positive squares in only one way, i.e., 259918884 + 121220100 = 16122^2 + 11010^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2646727 + ... + 2646870.

Almost surely, 2^381138984 is an apocalyptic number.

It is an amenable number.

381138984 is an abundant number, since it is smaller than the sum of its proper divisors (651112626).

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

381138984 is a wasteful number, since it uses less digits than its factorization.

381138984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5293609 (or 5293602 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 381138984 is about 19522.7811543335. The cubic root of 381138984 is about 725.0385926345.

The spelling of 381138984 in words is "three hundred eighty-one million, one hundred thirty-eight thousand, nine hundred eighty-four".