381856365 has 24 divisors (see below), whose sum is σ = 722056608. Its totient is φ = 185142240.

The previous prime is 381856339. The next prime is 381856399. The reversal of 381856365 is 563658183.

381856365 is a `hidden beast` number, since 3 + 8 + 1 + 8 + 5 + 636 + 5 = 666.

It is not a de Polignac number, because 381856365 - 2¹⁴ = 381839981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 381856365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 385219 + ... + 386208.

It is an arithmetic number, because the mean of its divisors is an integer number (30085692).

Almost surely, 2^381856365 is an apocalyptic number.

It is an amenable number.

381856365 is a deficient number, since it is larger than the sum of its proper divisors (340200243).

381856365 is a wasteful number, since it uses less digits than its factorization.

381856365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771449 (or 771446 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 381856365 is about 19541.1454372562. The cubic root of 381856365 is about 725.4931975108.

The spelling of 381856365 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, three hundred sixty-five".