4008643109 has 4 divisors (see below), whose sum is σ = 4010484960. Its totient is φ = 4006801260.

The previous prime is 4008643097. The next prime is 4008643127. The reversal of 4008643109 is 9013468004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4008643109 - 2²⁴ = 3991865893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4008643169) 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, 917657 + ... + 922014.

It is an arithmetic number, because the mean of its divisors is an integer number (1002621240).

Almost surely, 2^4008643109 is an apocalyptic number.

It is an amenable number.

4008643109 is a deficient number, since it is larger than the sum of its proper divisors (1841851).

4008643109 is a wasteful number, since it uses less digits than its factorization.

4008643109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841850.

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

The square root of 4008643109 is about 63313.8461080987. The cubic root of 4008643109 is about 1588.5435694809.

The spelling of 4008643109 in words is "four billion, eight million, six hundred forty-three thousand, one hundred nine".