428408347 has 4 divisors (see below), whose sum is σ = 453608856. Its totient is φ = 403207840.

The previous prime is 428408297. The next prime is 428408363. The reversal of 428408347 is 743804824.

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 428408347 - 2¹⁵ = 428375579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428408647) 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, 12600229 + ... + 12600262.

It is an arithmetic number, because the mean of its divisors is an integer number (113402214).

Almost surely, 2^428408347 is an apocalyptic number.

428408347 is a deficient number, since it is larger than the sum of its proper divisors (25200509).

428408347 is a wasteful number, since it uses less digits than its factorization.

428408347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25200508.

The product of its (nonzero) digits is 172032, while the sum is 40.

The square root of 428408347 is about 20698.0276113450. The cubic root of 428408347 is about 753.8517973816.

The spelling of 428408347 in words is "four hundred twenty-eight million, four hundred eight thousand, three hundred forty-seven".