428109 has 8 divisors (see below), whose sum is σ = 622752. Its totient is φ = 259440.

The previous prime is 428093. The next prime is 428137. The reversal of 428109 is 901824.

428109 = T₃₉ + T₄₀ + ... + T₁₃₇.

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

It is not a de Polignac number, because 428109 - 2⁴ = 428093 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 428109.

It is not an unprimeable number, because it can be changed into a prime (428149) 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, 6454 + ... + 6519.

It is an arithmetic number, because the mean of its divisors is an integer number (77844).

2⁴²⁸¹⁰⁹ is an apocalyptic number.

It is an amenable number.

428109 is a deficient number, since it is larger than the sum of its proper divisors (194643).

428109 is a wasteful number, since it uses less digits than its factorization.

428109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12987.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 428109 is about 654.3003897294. The cubic root of 428109 is about 75.3676173777.

The spelling of 428109 in words is "four hundred twenty-eight thousand, one hundred nine".