8381663 has 8 divisors (see below), whose sum is σ = 8988480. Its totient is φ = 7788768.

The previous prime is 8381627. The next prime is 8381669. The reversal of 8381663 is 3661838.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-8381663 is a prime.

It is a Duffinian number.

Its product of digits (20736) is a multiple of the sum of its prime divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8381669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106058 + ... + 106136.

It is an arithmetic number, because the mean of its divisors is an integer number (1123560).

Almost surely, 2^8381663 is an apocalyptic number.

8381663 is a deficient number, since it is larger than the sum of its proper divisors (606817).

8381663 is an frugal number, since it uses more digits than its factorization.

8381663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 96 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 8381663 is about 2895.1101878858. The cubic root of 8381663 is about 203.1312456620.

The spelling of 8381663 in words is "eight million, three hundred eighty-one thousand, six hundred sixty-three".