1689869677 has 4 divisors (see below), whose sum is σ = 1690463196. Its totient is φ = 1689276160.

The previous prime is 1689869663. The next prime is 1689869707. The reversal of 1689869677 is 7769689861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7769689861 = 263 ⋅29542547.

It can be written as a sum of positive squares in 2 ways, for example, as 575712036 + 1114157641 = 23994^2 + 33379^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689869677 - 2²⁷ = 1555651949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689869617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292468 + ... + 298189.

It is an arithmetic number, because the mean of its divisors is an integer number (422615799).

Almost surely, 2^1689869677 is an apocalyptic number.

It is an amenable number.

1689869677 is a deficient number, since it is larger than the sum of its proper divisors (593519).

1689869677 is an equidigital number, since it uses as much as digits as its factorization.

1689869677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593518.

The product of its digits is 54867456, while the sum is 67.

The square root of 1689869677 is about 41108.0244842780. The cubic root of 1689869677 is about 1191.1078065133.

The spelling of 1689869677 in words is "one billion, six hundred eighty-nine million, eight hundred sixty-nine thousand, six hundred seventy-seven".