187641421 has 8 divisors (see below), whose sum is σ = 204927264. Its totient is φ = 170393520.

The previous prime is 187641413. The next prime is 187641431. The reversal of 187641421 is 124146781.

It is a happy number.

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

It is not a de Polignac number, because 187641421 - 2³ = 187641413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187641401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1411 + ... + 19423.

It is an arithmetic number, because the mean of its divisors is an integer number (25615908).

Almost surely, 2^187641421 is an apocalyptic number.

187641421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

187641421 is a deficient number, since it is larger than the sum of its proper divisors (17285843).

187641421 is a wasteful number, since it uses less digits than its factorization.

187641421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18971.

The product of its digits is 10752, while the sum is 34.

The square root of 187641421 is about 13698.2269290591. The cubic root of 187641421 is about 572.5009843426.

The spelling of 187641421 in words is "one hundred eighty-seven million, six hundred forty-one thousand, four hundred twenty-one".