1689043965 has 24 divisors (see below), whose sum is σ = 3143691360. Its totient is φ = 772134048.

The previous prime is 1689043949. The next prime is 1689043973. The reversal of 1689043965 is 5693409861.

It is not a de Polignac number, because 1689043965 - 2⁴ = 1689043949 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, 1148275 + ... + 1149744.

It is an arithmetic number, because the mean of its divisors is an integer number (130987140).

Almost surely, 2^1689043965 is an apocalyptic number.

1689043965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1689043965 is a deficient number, since it is larger than the sum of its proper divisors (1454647395).

1689043965 is a wasteful number, since it uses less digits than its factorization.

1689043965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2298041 (or 2298034 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 1689043965 is about 41097.9800598521. The cubic root of 1689043965 is about 1190.9137733569.

The spelling of 1689043965 in words is "one billion, six hundred eighty-nine million, forty-three thousand, nine hundred sixty-five".