1689804919 has 16 divisors (see below), whose sum is σ = 1959310080. Its totient is φ = 1441186560.

The previous prime is 1689804901. The next prime is 1689804943. The reversal of 1689804919 is 9194089861.

It is not a de Polignac number, because 1689804919 - 2⁵ = 1689804887 is a prime.

It is a super-2 number, since 2×1689804919² = 5710881328553193122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1689804919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689804419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17722 + ... + 60775.

It is an arithmetic number, because the mean of its divisors is an integer number (122456880).

Almost surely, 2^1689804919 is an apocalyptic number.

1689804919 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1689804919 is a deficient number, since it is larger than the sum of its proper divisors (269505161).

1689804919 is a wasteful number, since it uses less digits than its factorization.

1689804919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78630.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 1689804919 is about 41107.2368202972. The cubic root of 1689804919 is about 1191.0925913864.

It can be divided in two parts, 1689 and 804919, that added together give a palindrome (806608).

The spelling of 1689804919 in words is "one billion, six hundred eighty-nine million, eight hundred four thousand, nine hundred nineteen".