187212489 has 16 divisors (see below), whose sum is σ = 258916800. Its totient is φ = 120225600.

The previous prime is 187212457. The next prime is 187212523. The reversal of 187212489 is 984212781.

It is not a de Polignac number, because 187212489 - 2⁵ = 187212457 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 187212489.

It is not an unprimeable number, because it can be changed into a prime (187212409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2862 + ... + 19560.

It is an arithmetic number, because the mean of its divisors is an integer number (16182300).

Almost surely, 2^187212489 is an apocalyptic number.

It is an amenable number.

187212489 is a deficient number, since it is larger than the sum of its proper divisors (71704311).

187212489 is a wasteful number, since it uses less digits than its factorization.

187212489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16840.

The product of its digits is 64512, while the sum is 42.

The square root of 187212489 is about 13682.5614926446. The cubic root of 187212489 is about 572.0644223413.

The spelling of 187212489 in words is "one hundred eighty-seven million, two hundred twelve thousand, four hundred eighty-nine".