239987197 has 4 divisors (see below), whose sum is σ = 242230176. Its totient is φ = 237744220.

The previous prime is 239987131. The next prime is 239987203. The reversal of 239987197 is 791789932.

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 a de Polignac number, because none of the positive numbers 2^k-239987197 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 (239987117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121329 + ... + 1121542.

It is an arithmetic number, because the mean of its divisors is an integer number (60557544).

Almost surely, 2^239987197 is an apocalyptic number.

It is an amenable number.

239987197 is a deficient number, since it is larger than the sum of its proper divisors (2242979).

239987197 is a wasteful number, since it uses less digits than its factorization.

239987197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242978.

The product of its digits is 1714608, while the sum is 55.

The square root of 239987197 is about 15491.5201642705. The cubic root of 239987197 is about 621.4354504671.

The spelling of 239987197 in words is "two hundred thirty-nine million, nine hundred eighty-seven thousand, one hundred ninety-seven".