428069409 has 4 divisors (see below), whose sum is σ = 570759216. Its totient is φ = 285379604.

The previous prime is 428069381. The next prime is 428069413. The reversal of 428069409 is 904960824.

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.

It is a cyclic number.

It is not a de Polignac number, because 428069409 - 2⁹ = 428068897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (428069489) 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, 71344899 + ... + 71344904.

It is an arithmetic number, because the mean of its divisors is an integer number (142689804).

Almost surely, 2^428069409 is an apocalyptic number.

It is an amenable number.

428069409 is a deficient number, since it is larger than the sum of its proper divisors (142689807).

428069409 is a wasteful number, since it uses less digits than its factorization.

428069409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142689806.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 428069409 is about 20689.8383028964. The cubic root of 428069409 is about 753.6529400419.

The spelling of 428069409 in words is "four hundred twenty-eight million, sixty-nine thousand, four hundred nine".