1992640321 has 15 divisors (see below), whose sum is σ = 2327163233. Its totient is φ = 1706102580.

The previous prime is 1992640301. The next prime is 1992640327. The reversal of 1992640321 is 1230462991.

The square root of 1992640321 is 44639.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1992640321 - 2⁹ = 1992639809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1992640327) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2186856 + ... + 2187766.

Almost surely, 2^1992640321 is an apocalyptic number.

1992640321 is the 44639-th square number.

1992640321 is the 22320-th centered octagonal number.

It is an amenable number.

1992640321 is a deficient number, since it is larger than the sum of its proper divisors (334522912).

1992640321 is an frugal number, since it uses more digits than its factorization.

1992640321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1850 (or 918 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The cubic root of 1992640321 is about 1258.3737146094.

The spelling of 1992640321 in words is "one billion, nine hundred ninety-two million, six hundred forty thousand, three hundred twenty-one".