429399809 has 4 divisors (see below), whose sum is σ = 429554004. Its totient is φ = 429245616.

The previous prime is 429399793. The next prime is 429399853. The reversal of 429399809 is 908993924.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 247905025 + 181494784 = 15745^2 + 13472^2 .

It is a cyclic number.

It is not a de Polignac number, because 429399809 - 2⁴ = 429399793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (429399869) 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, 72842 + ... + 78515.

It is an arithmetic number, because the mean of its divisors is an integer number (107388501).

Almost surely, 2^429399809 is an apocalyptic number.

It is an amenable number.

429399809 is a deficient number, since it is larger than the sum of its proper divisors (154195).

429399809 is a wasteful number, since it uses less digits than its factorization.

429399809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154194.

The product of its (nonzero) digits is 1259712, while the sum is 53.

The square root of 429399809 is about 20721.9644097754. The cubic root of 429399809 is about 754.4328937250.

The spelling of 429399809 in words is "four hundred twenty-nine million, three hundred ninety-nine thousand, eight hundred nine".