1645905846 has 32 divisors (see below), whose sum is σ = 3667275360. Its totient is φ = 488968704.

The previous prime is 1645905841. The next prime is 1645905851. The reversal of 1645905846 is 6485095461.

It is an interprime number because it is at equal distance from previous prime (1645905841) and next prime (1645905851).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1645905795 and 1645905804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645905841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361555 + ... + 366078.

It is an arithmetic number, because the mean of its divisors is an integer number (114602355).

Almost surely, 2^1645905846 is an apocalyptic number.

1645905846 is an abundant number, since it is smaller than the sum of its proper divisors (2021369514).

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

1645905846 is a wasteful number, since it uses less digits than its factorization.

1645905846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727680.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 1645905846 is about 40569.7651706292. The cubic root of 1645905846 is about 1180.6875830861.

The spelling of 1645905846 in words is "one billion, six hundred forty-five million, nine hundred five thousand, eight hundred forty-six".