1689991354 has 16 divisors (see below), whose sum is σ = 2605480488. Its totient is φ = 821532672.

The previous prime is 1689991333. The next prime is 1689991357. The reversal of 1689991354 is 4531999861.

It can be written as a sum of positive squares in 4 ways, for example, as 1666517329 + 23474025 = 40823^2 + 4845^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1689991295 and 1689991304.

It is not an unprimeable number, because it can be changed into a prime (1689991357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98074 + ... + 114010.

Almost surely, 2^1689991354 is an apocalyptic number.

1689991354 is a deficient number, since it is larger than the sum of its proper divisors (915489134).

1689991354 is a wasteful number, since it uses less digits than its factorization.

1689991354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17409.

The product of its digits is 2099520, while the sum is 55.

The square root of 1689991354 is about 41109.5044241596. The cubic root of 1689991354 is about 1191.1363939143.

The spelling of 1689991354 in words is "one billion, six hundred eighty-nine million, nine hundred ninety-one thousand, three hundred fifty-four".