3638787 has 16 divisors (see below), whose sum is σ = 5018112. Its totient is φ = 2344160.

The previous prime is 3638777. The next prime is 3638809. The reversal of 3638787 is 7878363.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 3638787 - 2⁴ = 3638771 is a prime.

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

Its product of digits (169344) is a multiple of the sum of its prime divisors (378).

3638787 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3638777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18373 + ... + 18569.

It is an arithmetic number, because the mean of its divisors is an integer number (313632).

Almost surely, 2^3638787 is an apocalyptic number.

3638787 is a deficient number, since it is larger than the sum of its proper divisors (1379325).

3638787 is a wasteful number, since it uses less digits than its factorization.

3638787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378.

The product of its digits is 169344, while the sum is 42.

The square root of 3638787 is about 1907.5604839690. The cubic root of 3638787 is about 153.8103444797.

The spelling of 3638787 in words is "three million, six hundred thirty-eight thousand, seven hundred eighty-seven".