1644654146 has 24 divisors (see below), whose sum is σ = 2618866944. Its totient is φ = 773166680.

The previous prime is 1644654139. The next prime is 1644654149. The reversal of 1644654146 is 6414564461.

It is not an unprimeable number, because it can be changed into a prime (1644654149) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 154991 + ... + 165261.

It is an arithmetic number, because the mean of its divisors is an integer number (109119456).

Almost surely, 2^1644654146 is an apocalyptic number.

1644654146 is a deficient number, since it is larger than the sum of its proper divisors (974212798).

1644654146 is a wasteful number, since it uses less digits than its factorization.

1644654146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10414 (or 10355 counting only the distinct ones).

The product of its digits is 276480, while the sum is 41.

The square root of 1644654146 is about 40554.3357238163. The cubic root of 1644654146 is about 1180.3882056044.

The spelling of 1644654146 in words is "one billion, six hundred forty-four million, six hundred fifty-four thousand, one hundred forty-six".