1643934924 has 18 divisors (see below), whose sum is σ = 4155502260. Its totient is φ = 547978296.

The previous prime is 1643934869. The next prime is 1643934949. The reversal of 1643934924 is 4294393461.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1643934924.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 22832394 + ... + 22832465.

Almost surely, 2^1643934924 is an apocalyptic number.

It is an amenable number.

1643934924 is an abundant number, since it is smaller than the sum of its proper divisors (2511567336).

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

1643934924 is a wasteful number, since it uses less digits than its factorization.

1643934924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45664869 (or 45664864 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 1643934924 is about 40545.4673668956. The cubic root of 1643934924 is about 1180.2161157356.

The spelling of 1643934924 in words is "one billion, six hundred forty-three million, nine hundred thirty-four thousand, nine hundred twenty-four".