381366387 has 24 divisors (see below), whose sum is σ = 573083056. Its totient is φ = 253435392.

The previous prime is 381366367. The next prime is 381366397. The reversal of 381366387 is 783663183.

381366387 is a `hidden beast` number, since 3 + 8 + 1 + 3 + 6 + 638 + 7 = 666.

It is not a de Polignac number, because 381366387 - 2¹⁰ = 381365363 is a prime.

It is a super-2 number, since 2×381366387² = 290880642266867538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381366317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79563 + ... + 84219.

Almost surely, 2^381366387 is an apocalyptic number.

381366387 is a deficient number, since it is larger than the sum of its proper divisors (191716669).

381366387 is an equidigital number, since it uses as much as digits as its factorization.

381366387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5009 (or 4997 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 381366387 is about 19528.6043280107. The cubic root of 381366387 is about 725.1827597916.

The spelling of 381366387 in words is "three hundred eighty-one million, three hundred sixty-six thousand, three hundred eighty-seven".