187493421 has 16 divisors (see below), whose sum is σ = 252648000. Its totient is φ = 123674880.

The previous prime is 187493417. The next prime is 187493429. The reversal of 187493421 is 124394781.

It is not a de Polignac number, because 187493421 - 2² = 187493417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 187493421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (187493429) 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, 124330 + ... + 125828.

It is an arithmetic number, because the mean of its divisors is an integer number (15790500).

Almost surely, 2^187493421 is an apocalyptic number.

It is an amenable number.

187493421 is a deficient number, since it is larger than the sum of its proper divisors (65154579).

187493421 is a wasteful number, since it uses less digits than its factorization.

187493421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916.

The product of its digits is 48384, while the sum is 39.

The square root of 187493421 is about 13692.8237044081. The cubic root of 187493421 is about 572.3504269095.

The spelling of 187493421 in words is "one hundred eighty-seven million, four hundred ninety-three thousand, four hundred twenty-one".