2143244399 has 4 divisors (see below), whose sum is σ = 2193087336. Its totient is φ = 2093401464.

The previous prime is 2143244381. The next prime is 2143244429. The reversal of 2143244399 is 9934423412.

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

It is a cyclic number.

It is not a de Polignac number, because 2143244399 - 2²⁴ = 2126467183 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 (2143244329) 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, 24921404 + ... + 24921489.

It is an arithmetic number, because the mean of its divisors is an integer number (548271834).

Almost surely, 2^2143244399 is an apocalyptic number.

2143244399 is a deficient number, since it is larger than the sum of its proper divisors (49842937).

2143244399 is an equidigital number, since it uses as much as digits as its factorization.

2143244399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49842936.

The product of its digits is 186624, while the sum is 41.

The square root of 2143244399 is about 46295.1876440738. The cubic root of 2143244399 is about 1289.3096478458.

The spelling of 2143244399 in words is "two billion, one hundred forty-three million, two hundred forty-four thousand, three hundred ninety-nine".