428505397 has 4 divisors (see below), whose sum is σ = 428547040. Its totient is φ = 428463756.

The previous prime is 428505331. The next prime is 428505409. The reversal of 428505397 is 793505824.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 428505397 - 2¹¹ = 428503349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428505097) 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, 7054 + ... + 30112.

It is an arithmetic number, because the mean of its divisors is an integer number (107136760).

Almost surely, 2^428505397 is an apocalyptic number.

It is an amenable number.

428505397 is a deficient number, since it is larger than the sum of its proper divisors (41643).

428505397 is a wasteful number, since it uses less digits than its factorization.

428505397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41642.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 428505397 is about 20700.3719048717. The cubic root of 428505397 is about 753.9087179914.

The spelling of 428505397 in words is "four hundred twenty-eight million, five hundred five thousand, three hundred ninety-seven".