187968149 has 4 divisors (see below), whose sum is σ = 192552780. Its totient is φ = 183383520.

The previous prime is 187968139. The next prime is 187968161. The reversal of 187968149 is 941869781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 941869781 = 619 ⋅1521599.

It can be written as a sum of positive squares in 2 ways, for example, as 13912900 + 174055249 = 3730^2 + 13193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187968149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 187968149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187968139) 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, 2292254 + ... + 2292335.

It is an arithmetic number, because the mean of its divisors is an integer number (48138195).

Almost surely, 2^187968149 is an apocalyptic number.

It is an amenable number.

187968149 is a deficient number, since it is larger than the sum of its proper divisors (4584631).

187968149 is an equidigital number, since it uses as much as digits as its factorization.

187968149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4584630.

The product of its digits is 870912, while the sum is 53.

The square root of 187968149 is about 13710.1476651420. The cubic root of 187968149 is about 572.8330781100.

The spelling of 187968149 in words is "one hundred eighty-seven million, nine hundred sixty-eight thousand, one hundred forty-nine".