187725990 has 64 divisors (see below), whose sum is σ = 476098560. Its totient is φ = 47295360.

The previous prime is 187725971. The next prime is 187725991. The reversal of 187725990 is 99527781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187725991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38595 + ... + 43185.

It is an arithmetic number, because the mean of its divisors is an integer number (7439040).

Almost surely, 2^187725990 is an apocalyptic number.

187725990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 187725990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238049280).

187725990 is an abundant number, since it is smaller than the sum of its proper divisors (288372570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

187725990 is a wasteful number, since it uses less digits than its factorization.

187725990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4677.

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 187725990 is about 13701.3134406888. The cubic root of 187725990 is about 572.5869791507.

The spelling of 187725990 in words is "one hundred eighty-seven million, seven hundred twenty-five thousand, nine hundred ninety".