381687745 has 16 divisors (see below), whose sum is σ = 473820480. Its totient is φ = 294940224.

The previous prime is 381687743. The next prime is 381687749. The reversal of 381687745 is 547786183.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 381687745 - 2¹ = 381687743 is a prime.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18294 + ... + 33136.

It is an arithmetic number, because the mean of its divisors is an integer number (29613780).

Almost surely, 2^381687745 is an apocalyptic number.

It is an amenable number.

381687745 is a deficient number, since it is larger than the sum of its proper divisors (92132735).

381687745 is a wasteful number, since it uses less digits than its factorization.

381687745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15024.

The product of its digits is 1128960, while the sum is 49.

The square root of 381687745 is about 19536.8304747725. The cubic root of 381687745 is about 725.3863941111.

The spelling of 381687745 in words is "three hundred eighty-one million, six hundred eighty-seven thousand, seven hundred forty-five".