381816727 has 4 divisors (see below), whose sum is σ = 392136136. Its totient is φ = 371497320.

The previous prime is 381816713. The next prime is 381816749. The reversal of 381816727 is 727618183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 727618183 = 967 ⋅752449.

It is a cyclic number.

It is not a de Polignac number, because 381816727 - 2²³ = 373428119 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381816707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5159649 + ... + 5159722.

It is an arithmetic number, because the mean of its divisors is an integer number (98034034).

Almost surely, 2^381816727 is an apocalyptic number.

381816727 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

381816727 is the 11282-nd hex number.

381816727 is a deficient number, since it is larger than the sum of its proper divisors (10319409).

381816727 is a wasteful number, since it uses less digits than its factorization.

381816727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10319408.

The product of its digits is 112896, while the sum is 43.

The square root of 381816727 is about 19540.1311919854. The cubic root of 381816727 is about 725.4680937483.

The spelling of 381816727 in words is "three hundred eighty-one million, eight hundred sixteen thousand, seven hundred twenty-seven".