3638947 has 4 divisors (see below), whose sum is σ = 3918880. Its totient is φ = 3359016.

The previous prime is 3638941. The next prime is 3638951. The reversal of 3638947 is 7498363.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3638947 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3638941) 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, 139947 + ... + 139972.

It is an arithmetic number, because the mean of its divisors is an integer number (979720).

Almost surely, 2^3638947 is an apocalyptic number.

3638947 is a deficient number, since it is larger than the sum of its proper divisors (279933).

3638947 is a wasteful number, since it uses less digits than its factorization.

3638947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279932.

The product of its digits is 108864, while the sum is 40.

The square root of 3638947 is about 1907.6024218898. The cubic root of 3638947 is about 153.8125988294.

It can be divided in two parts, 36 and 38947, that added together give a palindrome (38983).

The spelling of 3638947 in words is "three million, six hundred thirty-eight thousand, nine hundred forty-seven".