428109139 has 4 divisors (see below), whose sum is σ = 428184400. Its totient is φ = 428033880.

The previous prime is 428109091. The next prime is 428109169. The reversal of 428109139 is 931901824.

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 428109139 - 2¹¹ = 428107091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 428109098 and 428109107.

It is not an unprimeable number, because it can be changed into a prime (428109169) 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, 28332 + ... + 40729.

It is an arithmetic number, because the mean of its divisors is an integer number (107046100).

Almost surely, 2^428109139 is an apocalyptic number.

428109139 is a deficient number, since it is larger than the sum of its proper divisors (75261).

428109139 is an equidigital number, since it uses as much as digits as its factorization.

428109139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75260.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 428109139 is about 20690.7984137877. The cubic root of 428109139 is about 753.6762553457.

The spelling of 428109139 in words is "four hundred twenty-eight million, one hundred nine thousand, one hundred thirty-nine".