428187 has 8 divisors (see below), whose sum is σ = 581904. Its totient is φ = 279968.

The previous prime is 428177. The next prime is 428221. The reversal of 428187 is 781824.

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

It is a cyclic number.

It is not a de Polignac number, because 428187 - 2¹² = 424091 is a prime.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (428137) 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, 1188 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (72738).

2⁴²⁸¹⁸⁷ is an apocalyptic number.

428187 is a deficient number, since it is larger than the sum of its proper divisors (153717).

428187 is a wasteful number, since it uses less digits than its factorization.

428187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2749.

The product of its digits is 3584, while the sum is 30.

The square root of 428187 is about 654.3599926646. The cubic root of 428187 is about 75.3721943407.

The spelling of 428187 in words is "four hundred twenty-eight thousand, one hundred eighty-seven".