381687744 has 56 divisors (see below), whose sum is σ = 1024989568. Its totient is φ = 125326080.

The previous prime is 381687743. The next prime is 381687749. The reversal of 381687744 is 447786183.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 381687693 and 381687702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381687743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1972 + ... + 27699.

Almost surely, 2^381687744 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 381687744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512494784).

381687744 is an abundant number, since it is smaller than the sum of its proper divisors (643301824).

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

381687744 is a wasteful number, since it uses less digits than its factorization.

381687744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29753 (or 29743 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The square root of 381687744 is about 19536.8304491798. The cubic root of 381687744 is about 725.3863934776.

The spelling of 381687744 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, seven hundred forty-four".