406897809 has 16 divisors (see below), whose sum is σ = 548409792. Its totient is φ = 268339968.

The previous prime is 406897759. The next prime is 406897823. The reversal of 406897809 is 908798604.

It is a happy number.

It is not a de Polignac number, because 406897809 - 2⁷ = 406897681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (406897859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127062 + ... + 130224.

It is an arithmetic number, because the mean of its divisors is an integer number (34275612).

Almost surely, 2^406897809 is an apocalyptic number.

It is an amenable number.

406897809 is a deficient number, since it is larger than the sum of its proper divisors (141511983).

406897809 is a wasteful number, since it uses less digits than its factorization.

406897809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616.

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 406897809 is about 20171.7081329272. The cubic root of 406897809 is about 741.0174760622.

The spelling of 406897809 in words is "four hundred six million, eight hundred ninety-seven thousand, eight hundred nine".