1686434436 has 18 divisors (see below), whose sum is σ = 4262931582. Its totient is φ = 562144800.

The previous prime is 1686434371. The next prime is 1686434461. The reversal of 1686434436 is 6344346861.

It is a happy number.

1686434436 is a `hidden beast` number, since 168 + 6 + 43 + 443 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1652910336 + 33524100 = 40656^2 + 5790^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1686434436² = 5688122213853276192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1686434391 and 1686434400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23422665 + ... + 23422736.

Almost surely, 2^1686434436 is an apocalyptic number.

It is an amenable number.

1686434436 is an abundant number, since it is smaller than the sum of its proper divisors (2576497146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686434436 is a wasteful number, since it uses less digits than its factorization.

1686434436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46845411 (or 46845406 counting only the distinct ones).

The product of its digits is 995328, while the sum is 45.

The square root of 1686434436 is about 41066.2201328537. The cubic root of 1686434436 is about 1190.3001469666.

The spelling of 1686434436 in words is "one billion, six hundred eighty-six million, four hundred thirty-four thousand, four hundred thirty-six".