1643933416 has 32 divisors (see below), whose sum is σ = 3101041440. Its totient is φ = 817005888.

The previous prime is 1643933413. The next prime is 1643933419. The reversal of 1643933416 is 6143393461.

It is an interprime number because it is at equal distance from previous prime (1643933413) and next prime (1643933419).

It is not an unprimeable number, because it can be changed into a prime (1643933413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1328350 + ... + 1329586.

It is an arithmetic number, because the mean of its divisors is an integer number (96907545).

Almost surely, 2^1643933416 is an apocalyptic number.

It is an amenable number.

1643933416 is a deficient number, since it is larger than the sum of its proper divisors (1457108024).

1643933416 is a wasteful number, since it uses less digits than its factorization.

1643933416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2109 counting only the distinct ones).

The product of its digits is 139968, while the sum is 40.

The square root of 1643933416 is about 40545.4487704847. The cubic root of 1643933416 is about 1180.2157548603.

The spelling of 1643933416 in words is "one billion, six hundred forty-three million, nine hundred thirty-three thousand, four hundred sixteen".