1604406213 has 12 divisors (see below), whose sum is σ = 2323260108. Its totient is φ = 1066934400.

The previous prime is 1604406211. The next prime is 1604406233. The reversal of 1604406213 is 3126044061.

1604406213 is a `hidden beast` number, since 1 + 6 + 0 + 440 + 6 + 213 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1032144129 + 572262084 = 32127^2 + 23922^2 .

It is not a de Polignac number, because 1604406213 - 2¹ = 1604406211 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604406211) 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 11 ways as a sum of consecutive naturals, for example, 218670 + ... + 225887.

It is an arithmetic number, because the mean of its divisors is an integer number (193605009).

Almost surely, 2^1604406213 is an apocalyptic number.

It is an amenable number.

1604406213 is a deficient number, since it is larger than the sum of its proper divisors (718853895).

1604406213 is a wasteful number, since it uses less digits than its factorization.

1604406213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444964 (or 444961 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1604406213 is about 40055.0397952617. The cubic root of 1604406213 is about 1170.6797649655.

The spelling of 1604406213 in words is "one billion, six hundred four million, four hundred six thousand, two hundred thirteen".