1921645132 has 24 divisors (see below), whose sum is σ = 3684359952. Its totient is φ = 869721600.

The previous prime is 1921645109. The next prime is 1921645139. The reversal of 1921645132 is 2315461291.

It is not an unprimeable number, because it can be changed into a prime (1921645139) 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, 83469 + ... + 103972.

It is an arithmetic number, because the mean of its divisors is an integer number (153514998).

Almost surely, 2^1921645132 is an apocalyptic number.

It is an amenable number.

1921645132 is a deficient number, since it is larger than the sum of its proper divisors (1762714820).

1921645132 is a wasteful number, since it uses less digits than its factorization.

1921645132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187689 (or 187687 counting only the distinct ones).

The product of its digits is 12960, while the sum is 34.

The square root of 1921645132 is about 43836.5729956163. The cubic root of 1921645132 is about 1243.2478876817.

The spelling of 1921645132 in words is "one billion, nine hundred twenty-one million, six hundred forty-five thousand, one hundred thirty-two".