406642811 has 4 divisors (see below), whose sum is σ = 406721400. Its totient is φ = 406564224.

The previous prime is 406642759. The next prime is 406642823. The reversal of 406642811 is 118246604.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406642811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406642861) 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, 30941 + ... + 42078.

It is an arithmetic number, because the mean of its divisors is an integer number (101680350).

Almost surely, 2^406642811 is an apocalyptic number.

406642811 is a deficient number, since it is larger than the sum of its proper divisors (78589).

406642811 is an equidigital number, since it uses as much as digits as its factorization.

406642811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78588.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 406642811 is about 20165.3864579879. The cubic root of 406642811 is about 740.8626481123.

The spelling of 406642811 in words is "four hundred six million, six hundred forty-two thousand, eight hundred eleven".