187420545 has 24 divisors (see below), whose sum is σ = 349852776. Its totient is φ = 92268288.

The previous prime is 187420543. The next prime is 187420547. The reversal of 187420545 is 545024781.

187420545 is a `hidden beast` number, since 187 + 420 + 54 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (187420543) and next prime (187420547).

It can be written as a sum of positive squares in 4 ways, for example, as 5089536 + 182331009 = 2256^2 + 13503^2 .

It is not a de Polignac number, because 187420545 - 2¹ = 187420543 is a prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (187420543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159604 + ... + 160773.

It is an arithmetic number, because the mean of its divisors is an integer number (14577199).

Almost surely, 2^187420545 is an apocalyptic number.

187420545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

187420545 is a deficient number, since it is larger than the sum of its proper divisors (162432231).

187420545 is a wasteful number, since it uses less digits than its factorization.

187420545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320401 (or 320398 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The square root of 187420545 is about 13690.1623438146. The cubic root of 187420545 is about 572.2762625028.

The spelling of 187420545 in words is "one hundred eighty-seven million, four hundred twenty thousand, five hundred forty-five".