381383840 has 24 divisors (see below), whose sum is σ = 901019700. Its totient is φ = 152553472.

The previous prime is 381383839. The next prime is 381383857. The reversal of 381383840 is 48383183.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 332551696 + 48832144 = 18236^2 + 6988^2 .

It is a junction number, because it is equal to n+sod(n) for n = 381383794 and 381383803.

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, 1191665 + ... + 1191984.

Almost surely, 2^381383840 is an apocalyptic number.

It is an amenable number.

381383840 is an abundant number, since it is smaller than the sum of its proper divisors (519635860).

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

381383840 is a wasteful number, since it uses less digits than its factorization.

381383840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2383664 (or 2383656 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 381383840 is about 19529.0511802289. The cubic root of 381383840 is about 725.1938221384.

The spelling of 381383840 in words is "three hundred eighty-one million, three hundred eighty-three thousand, eight hundred forty".