187764145 has 4 divisors (see below), whose sum is σ = 225316980. Its totient is φ = 150211312.

The previous prime is 187764139. The next prime is 187764149. The reversal of 187764145 is 541467781.

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 83887281 + 103876864 = 9159^2 + 10192^2 .

It is a cyclic number.

It is not a de Polignac number, because 187764145 - 2⁹ = 187763633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (187764149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18776410 + ... + 18776419.

It is an arithmetic number, because the mean of its divisors is an integer number (56329245).

Almost surely, 2^187764145 is an apocalyptic number.

It is an amenable number.

187764145 is a deficient number, since it is larger than the sum of its proper divisors (37552835).

187764145 is an equidigital number, since it uses as much as digits as its factorization.

187764145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37552834.

The product of its digits is 188160, while the sum is 43.

The square root of 187764145 is about 13702.7057547041. The cubic root of 187764145 is about 572.6257689781.

The spelling of 187764145 in words is "one hundred eighty-seven million, seven hundred sixty-four thousand, one hundred forty-five".