1923639965 has 24 divisors (see below), whose sum is σ = 2507063400. Its totient is φ = 1416290304.

The previous prime is 1923639911. The next prime is 1923639973. The reversal of 1923639965 is 5699363291.

It can be written as a sum of positive squares in 12 ways, for example, as 606095161 + 1317544804 = 24619^2 + 36298^2 .

It is not a de Polignac number, because 1923639965 - 2¹² = 1923635869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295061 + ... + 301509.

It is an arithmetic number, because the mean of its divisors is an integer number (104460975).

Almost surely, 2^1923639965 is an apocalyptic number.

It is an amenable number.

1923639965 is a deficient number, since it is larger than the sum of its proper divisors (583423435).

1923639965 is a wasteful number, since it uses less digits than its factorization.

1923639965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6833 (or 6820 counting only the distinct ones).

The product of its digits is 2361960, while the sum is 53.

The square root of 1923639965 is about 43859.3201611698. The cubic root of 1923639965 is about 1243.6779383348.

The spelling of 1923639965 in words is "one billion, nine hundred twenty-three million, six hundred thirty-nine thousand, nine hundred sixty-five".