187920155 has 16 divisors (see below), whose sum is σ = 228257568. Its totient is φ = 148512000.

The previous prime is 187920149. The next prime is 187920163. The reversal of 187920155 is 551029781.

It is not a de Polignac number, because 187920155 - 2¹² = 187916059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183545 + ... + 184565.

It is an arithmetic number, because the mean of its divisors is an integer number (14266098).

Almost surely, 2^187920155 is an apocalyptic number.

187920155 is a deficient number, since it is larger than the sum of its proper divisors (40337413).

187920155 is a wasteful number, since it uses less digits than its factorization.

187920155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 187920155 is about 13708.3972440253. The cubic root of 187920155 is about 572.7843200427.

The spelling of 187920155 in words is "one hundred eighty-seven million, nine hundred twenty thousand, one hundred fifty-five".