187213988 has 12 divisors (see below), whose sum is σ = 352826460. Its totient is φ = 86406432.

The previous prime is 187213987. The next prime is 187214017. The reversal of 187213988 is 889312781.

It can be written as a sum of positive squares in 2 ways, for example, as 94322944 + 92891044 = 9712^2 + 9638^2 .

It is not an unprimeable number, because it can be changed into a prime (187213987) 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, 1800083 + ... + 1800186.

It is an arithmetic number, because the mean of its divisors is an integer number (29402205).

Almost surely, 2^187213988 is an apocalyptic number.

It is an amenable number.

187213988 is a deficient number, since it is larger than the sum of its proper divisors (165612472).

187213988 is a wasteful number, since it uses less digits than its factorization.

187213988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3600286 (or 3600284 counting only the distinct ones).

The product of its digits is 193536, while the sum is 47.

The square root of 187213988 is about 13682.6162702898. The cubic root of 187213988 is about 572.0659491666.

The spelling of 187213988 in words is "one hundred eighty-seven million, two hundred thirteen thousand, nine hundred eighty-eight".