381646480 has 20 divisors (see below), whose sum is σ = 887328252. Its totient is φ = 152658560.

The previous prime is 381646471. The next prime is 381646493. The reversal of 381646480 is 84646183.

It can be written as a sum of positive squares in 2 ways, for example, as 130233744 + 251412736 = 11412^2 + 15856^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2385211 + ... + 2385370.

Almost surely, 2^381646480 is an apocalyptic number.

It is an amenable number.

381646480 is an abundant number, since it is smaller than the sum of its proper divisors (505681772).

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

381646480 is a wasteful number, since it uses less digits than its factorization.

381646480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770594 (or 4770588 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 381646480 is about 19535.7743639713. The cubic root of 381646480 is about 725.3602521938.

It can be divided in two parts, 38164 and 6480, that added together give a palindrome (44644).

The spelling of 381646480 in words is "three hundred eighty-one million, six hundred forty-six thousand, four hundred eighty".