1643227372 has 12 divisors (see below), whose sum is σ = 2915040856. Its totient is φ = 810358560.

The previous prime is 1643227367. The next prime is 1643227373. The reversal of 1643227372 is 2737223461.

It is not an unprimeable number, because it can be changed into a prime (1643227373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2813454 + ... + 2814037.

Almost surely, 2^1643227372 is an apocalyptic number.

It is an amenable number.

1643227372 is a deficient number, since it is larger than the sum of its proper divisors (1271813484).

1643227372 is a wasteful number, since it uses less digits than its factorization.

1643227372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627568 (or 5627566 counting only the distinct ones).

The product of its digits is 84672, while the sum is 37.

The square root of 1643227372 is about 40536.7410135546. The cubic root of 1643227372 is about 1180.0467691891.

The spelling of 1643227372 in words is "one billion, six hundred forty-three million, two hundred twenty-seven thousand, three hundred seventy-two".