406147466209 has 3 divisors (see below), whose sum is σ = 406148103507. Its totient is φ = 406146828912.

The previous prime is 406147466183. The next prime is 406147466251. The reversal of 406147466209 is 902664741604.

It is a happy number.

The square root of 406147466209 is 637297.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 109915456225 + 296232009984 = 331535^2 + 544272^2 .

It is not a de Polignac number, because 406147466209 - 2¹⁷ = 406147335137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406147416209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 318649 + ... + 955945.

It is an arithmetic number, because the mean of its divisors is an integer number (135382701169).

Almost surely, 2^406147466209 is an apocalyptic number.

406147466209 is the 637297-th square number.

406147466209 is the 318649-th centered octagonal number.

It is an amenable number.

406147466209 is a deficient number, since it is larger than the sum of its proper divisors (637298).

406147466209 is an frugal number, since it uses more digits than its factorization.

406147466209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274594 (or 637297 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

Multiplying 406147466209 by its sum of digits (49), we get a square (19901225844241 = 4461079²).

It can be divided in two parts, 406147 and 466209, that added together give a square (872356 = 934²).

The spelling of 406147466209 in words is "four hundred six billion, one hundred forty-seven million, four hundred sixty-six thousand, two hundred nine".