187872145 has 4 divisors (see below), whose sum is σ = 225446580. Its totient is φ = 150297712.

The previous prime is 187872137. The next prime is 187872149. The reversal of 187872145 is 541278781.

187872145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 25080064 + 162792081 = 5008^2 + 12759^2 .

It is a cyclic number.

It is not a de Polignac number, because 187872145 - 2³ = 187872137 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (187872149) 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, 18787210 + ... + 18787219.

It is an arithmetic number, because the mean of its divisors is an integer number (56361645).

Almost surely, 2^187872145 is an apocalyptic number.

It is an amenable number.

187872145 is a deficient number, since it is larger than the sum of its proper divisors (37574435).

187872145 is an equidigital number, since it uses as much as digits as its factorization.

187872145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37574434.

The product of its digits is 125440, while the sum is 43.

The square root of 187872145 is about 13706.6460157108. The cubic root of 187872145 is about 572.7355374140.

The spelling of 187872145 in words is "one hundred eighty-seven million, eight hundred seventy-two thousand, one hundred forty-five".