427993187 has 4 divisors (see below), whose sum is σ = 431919840. Its totient is φ = 424066536.

The previous prime is 427993169. The next prime is 427993193. The reversal of 427993187 is 781399724.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 427993187 - 2¹² = 427989091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (427993127) 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, 1963163 + ... + 1963380.

It is an arithmetic number, because the mean of its divisors is an integer number (107979960).

Almost surely, 2^427993187 is an apocalyptic number.

427993187 is a deficient number, since it is larger than the sum of its proper divisors (3926653).

427993187 is a wasteful number, since it uses less digits than its factorization.

427993187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3926652.

The product of its digits is 762048, while the sum is 50.

The square root of 427993187 is about 20687.9962055294. The cubic root of 427993187 is about 753.6082055953.

The spelling of 427993187 in words is "four hundred twenty-seven million, nine hundred ninety-three thousand, one hundred eighty-seven".