1689479845 has 8 divisors (see below), whose sum is σ = 2027676960. Its totient is φ = 1351383120.

The previous prime is 1689479843. The next prime is 1689479863. The reversal of 1689479845 is 5489749861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1689479845 - 2¹ = 1689479843 is a prime.

It is a super-2 number, since 2×1689479845² = 5708684293322448050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689479843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18966 + ... + 61144.

It is an arithmetic number, because the mean of its divisors is an integer number (253459620).

Almost surely, 2^1689479845 is an apocalyptic number.

It is an amenable number.

1689479845 is a deficient number, since it is larger than the sum of its proper divisors (338197115).

1689479845 is an equidigital number, since it uses as much as digits as its factorization.

1689479845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50195.

The product of its digits is 17418240, while the sum is 61.

The square root of 1689479845 is about 41103.2826547953. The cubic root of 1689479845 is about 1191.0162081977.

The spelling of 1689479845 in words is "one billion, six hundred eighty-nine million, four hundred seventy-nine thousand, eight hundred forty-five".