239673643 has 4 divisors (see below), whose sum is σ = 261462168. Its totient is φ = 217885120.

The previous prime is 239673601. The next prime is 239673647. The reversal of 239673643 is 346376932.

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 239673643 - 2⁹ = 239673131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 239673643.

It is not an unprimeable number, because it can be changed into a prime (239673647) 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, 10894246 + ... + 10894267.

It is an arithmetic number, because the mean of its divisors is an integer number (65365542).

Almost surely, 2^239673643 is an apocalyptic number.

239673643 is a deficient number, since it is larger than the sum of its proper divisors (21788525).

239673643 is a wasteful number, since it uses less digits than its factorization.

239673643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21788524.

The product of its digits is 489888, while the sum is 43.

The square root of 239673643 is about 15481.3966747190. The cubic root of 239673643 is about 621.1646881140.

The spelling of 239673643 in words is "two hundred thirty-nine million, six hundred seventy-three thousand, six hundred forty-three".