320140187 has 4 divisors (see below), whose sum is σ = 322973400. Its totient is φ = 317306976.

The previous prime is 320140127. The next prime is 320140211. The reversal of 320140187 is 781041023.

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 320140187 - 2²⁶ = 253031323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320140127) 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, 1416437 + ... + 1416662.

It is an arithmetic number, because the mean of its divisors is an integer number (80743350).

Almost surely, 2^320140187 is an apocalyptic number.

320140187 is a deficient number, since it is larger than the sum of its proper divisors (2833213).

320140187 is a wasteful number, since it uses less digits than its factorization.

320140187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2833212.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 320140187 is about 17892.4617367203. The cubic root of 320140187 is about 684.0902459212.

The spelling of 320140187 in words is "three hundred twenty million, one hundred forty thousand, one hundred eighty-seven".