406572809 has 4 divisors (see below), whose sum is σ = 406812420. Its totient is φ = 406333200.

The previous prime is 406572797. The next prime is 406572821. The reversal of 406572809 is 908275604.

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

It is an interprime number because it is at equal distance from previous prime (406572797) and next prime (406572821).

It can be written as a sum of positive squares in 2 ways, for example, as 197683600 + 208889209 = 14060^2 + 14453^2 .

It is a cyclic number.

It is not a de Polignac number, because 406572809 - 2¹² = 406568713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406572709) 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, 117242 + ... + 120659.

It is an arithmetic number, because the mean of its divisors is an integer number (101703105).

Almost surely, 2^406572809 is an apocalyptic number.

It is an amenable number.

406572809 is a deficient number, since it is larger than the sum of its proper divisors (239611).

406572809 is a wasteful number, since it uses less digits than its factorization.

406572809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239610.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 406572809 is about 20163.6506863217. The cubic root of 406572809 is about 740.8201334517.

The spelling of 406572809 in words is "four hundred six million, five hundred seventy-two thousand, eight hundred nine".