187239366397 has 4 divisors (see below), whose sum is σ = 190412915040. Its totient is φ = 184065817756.

The previous prime is 187239366361. The next prime is 187239366401. The reversal of 187239366397 is 793663932781.

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-187239366397 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 (187239366337) 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, 1586774233 + ... + 1586774350.

It is an arithmetic number, because the mean of its divisors is an integer number (47603228760).

Almost surely, 2^187239366397 is an apocalyptic number.

It is an amenable number.

187239366397 is a deficient number, since it is larger than the sum of its proper divisors (3173548643).

187239366397 is an equidigital number, since it uses as much as digits as its factorization.

187239366397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173548642.

The product of its digits is 61725888, while the sum is 64.

The spelling of 187239366397 in words is "one hundred eighty-seven billion, two hundred thirty-nine million, three hundred sixty-six thousand, three hundred ninety-seven".