3638143 has 4 divisors (see below), whose sum is σ = 3645648. Its totient is φ = 3630640.

The previous prime is 3638113. The next prime is 3638147. The reversal of 3638143 is 3418363.

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-3638143 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3638147) 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, 2971 + ... + 4012.

It is an arithmetic number, because the mean of its divisors is an integer number (911412).

Almost surely, 2^3638143 is an apocalyptic number.

3638143 is a deficient number, since it is larger than the sum of its proper divisors (7505).

3638143 is an equidigital number, since it uses as much as digits as its factorization.

3638143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7504.

The product of its digits is 5184, while the sum is 28.

The square root of 3638143 is about 1907.3916745126. The cubic root of 3638143 is about 153.8012700541.

The spelling of 3638143 in words is "three million, six hundred thirty-eight thousand, one hundred forty-three".