406721522947 has 12 divisors (see below), whose sum is σ = 416117260944. Its totient is φ = 397529518880.

The previous prime is 406721522891. The next prime is 406721522953. The reversal of 406721522947 is 749225127604.

It is a de Polignac number, because none of the positive numbers 2^k-406721522947 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406721522947.

It is not an unprimeable number, because it can be changed into a prime (406721522047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 463497 + ... + 1014037.

It is an arithmetic number, because the mean of its divisors is an integer number (34676438412).

Almost surely, 2^406721522947 is an apocalyptic number.

406721522947 is a deficient number, since it is larger than the sum of its proper divisors (9395737997).

406721522947 is an equidigital number, since it uses as much as digits as its factorization.

406721522947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550910 (or 550857 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 406721522947 in words is "four hundred six billion, seven hundred twenty-one million, five hundred twenty-two thousand, nine hundred forty-seven".