8638387 has 4 divisors (see below), whose sum is σ = 8645616. Its totient is φ = 8631160.

The previous prime is 8638381. The next prime is 8638403. The reversal of 8638387 is 7838368.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 8638387 - 2³ = 8638379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8638381) 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, 1348 + ... + 4369.

It is an arithmetic number, because the mean of its divisors is an integer number (2161404).

Almost surely, 2^8638387 is an apocalyptic number.

8638387 is a deficient number, since it is larger than the sum of its proper divisors (7229).

8638387 is a wasteful number, since it uses less digits than its factorization.

8638387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7228.

The product of its digits is 193536, while the sum is 43.

The square root of 8638387 is about 2939.1133016609. The cubic root of 8638387 is about 205.1843434028.

It can be divided in two parts, 8638 and 387, that added together give a square (9025 = 95²).

The spelling of 8638387 in words is "eight million, six hundred thirty-eight thousand, three hundred eighty-seven".