187949 has 4 divisors (see below), whose sum is σ = 194460. Its totient is φ = 181440.

The previous prime is 187931. The next prime is 187951. The reversal of 187949 is 949781.

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 145924 + 42025 = 382^2 + 205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-187949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3212 + ... + 3269.

It is an arithmetic number, because the mean of its divisors is an integer number (48615).

2¹⁸⁷⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

187949 is a deficient number, since it is larger than the sum of its proper divisors (6511).

187949 is an equidigital number, since it uses as much as digits as its factorization.

187949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510.

The product of its digits is 18144, while the sum is 38.

The square root of 187949 is about 433.5308524200. The cubic root of 187949 is about 57.2813625252.

The spelling of 187949 in words is "one hundred eighty-seven thousand, nine hundred forty-nine".