406656449 has 4 divisors (see below), whose sum is σ = 428059440. Its totient is φ = 385253460.

The previous prime is 406656443. The next prime is 406656451. The reversal of 406656449 is 944656604.

It is a happy number.

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 406656449 - 2⁸ = 406656193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406656443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10701467 + ... + 10701504.

It is an arithmetic number, because the mean of its divisors is an integer number (107014860).

Almost surely, 2^406656449 is an apocalyptic number.

It is an amenable number.

406656449 is a deficient number, since it is larger than the sum of its proper divisors (21402991).

406656449 is a wasteful number, since it uses less digits than its factorization.

406656449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21402990.

The product of its (nonzero) digits is 622080, while the sum is 44.

The square root of 406656449 is about 20165.7246088505. The cubic root of 406656449 is about 740.8709303784.

The spelling of 406656449 in words is "four hundred six million, six hundred fifty-six thousand, four hundred forty-nine".