381787827 has 4 divisors (see below), whose sum is σ = 509050440. Its totient is φ = 254525216.

The previous prime is 381787811. The next prime is 381787873. The reversal of 381787827 is 728787183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 728787183 = 3 ⋅242929061.

It is a cyclic number.

It is not a de Polignac number, because 381787827 - 2⁴ = 381787811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 381787827.

It is not an unprimeable number, because it can be changed into a prime (381787807) 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, 63631302 + ... + 63631307.

It is an arithmetic number, because the mean of its divisors is an integer number (127262610).

Almost surely, 2^381787827 is an apocalyptic number.

381787827 is a deficient number, since it is larger than the sum of its proper divisors (127262613).

381787827 is a wasteful number, since it uses less digits than its factorization.

381787827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127262612.

The product of its digits is 1053696, while the sum is 51.

The square root of 381787827 is about 19539.3916742564. The cubic root of 381787827 is about 725.4497895416.

The spelling of 381787827 in words is "three hundred eighty-one million, seven hundred eighty-seven thousand, eight hundred twenty-seven".