428813439 has 4 divisors (see below), whose sum is σ = 571751256. Its totient is φ = 285875624.

The previous prime is 428813431. The next prime is 428813509. The reversal of 428813439 is 934318824.

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 428813439 - 2³ = 428813431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428813439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428813431) 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, 71468904 + ... + 71468909.

It is an arithmetic number, because the mean of its divisors is an integer number (142937814).

Almost surely, 2^428813439 is an apocalyptic number.

428813439 is a deficient number, since it is larger than the sum of its proper divisors (142937817).

428813439 is a wasteful number, since it uses less digits than its factorization.

428813439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142937816.

The product of its digits is 165888, while the sum is 42.

The square root of 428813439 is about 20707.8110624952. The cubic root of 428813439 is about 754.0893302028.

The spelling of 428813439 in words is "four hundred twenty-eight million, eight hundred thirteen thousand, four hundred thirty-nine".