1645304406 has 16 divisors (see below), whose sum is σ = 3291132864. Its totient is φ = 548347464.

The previous prime is 1645304393. The next prime is 1645304413. The reversal of 1645304406 is 6044035461.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27585 + ... + 63651.

It is an arithmetic number, because the mean of its divisors is an integer number (205695804).

Almost surely, 2^1645304406 is an apocalyptic number.

1645304406 is an abundant number, since it is smaller than the sum of its proper divisors (1645828458).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1645304406 is a wasteful number, since it uses less digits than its factorization.

1645304406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43675.

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1645304406 is about 40562.3520767719. The cubic root of 1645304406 is about 1180.5437515997.

Adding to 1645304406 its reverse (6044035461), we get a palindrome (7689339867).

The spelling of 1645304406 in words is "one billion, six hundred forty-five million, three hundred four thousand, four hundred six".