239690789 has 4 divisors (see below), whose sum is σ = 258128556. Its totient is φ = 221253024.

The previous prime is 239690779. The next prime is 239690849. The reversal of 239690789 is 987096932.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16337764 + 223353025 = 4042^2 + 14945^2 .

It is a cyclic number.

It is not a de Polignac number, because 239690789 - 2¹² = 239686693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 239690789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (239690749) 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, 9218864 + ... + 9218889.

It is an arithmetic number, because the mean of its divisors is an integer number (64532139).

Almost surely, 2^239690789 is an apocalyptic number.

It is an amenable number.

239690789 is a deficient number, since it is larger than the sum of its proper divisors (18437767).

239690789 is a wasteful number, since it uses less digits than its factorization.

239690789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18437766.

The product of its (nonzero) digits is 1469664, while the sum is 53.

The square root of 239690789 is about 15481.9504262221. The cubic root of 239690789 is about 621.1795002500.

The spelling of 239690789 in words is "two hundred thirty-nine million, six hundred ninety thousand, seven hundred eighty-nine".