187821142 has 8 divisors (see below), whose sum is σ = 284225256. Its totient is φ = 93079392.

The previous prime is 187821133. The next prime is 187821143. The reversal of 187821142 is 241128781.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 187821098 and 187821107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187821143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415308 + ... + 415759.

It is an arithmetic number, because the mean of its divisors is an integer number (35528157).

Almost surely, 2^187821142 is an apocalyptic number.

187821142 is a deficient number, since it is larger than the sum of its proper divisors (96404114).

187821142 is a wasteful number, since it uses less digits than its factorization.

187821142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831182.

The product of its digits is 7168, while the sum is 34.

The square root of 187821142 is about 13704.7853686222. The cubic root of 187821142 is about 572.6837045139.

The spelling of 187821142 in words is "one hundred eighty-seven million, eight hundred twenty-one thousand, one hundred forty-two".