3685816429 has 4 divisors (see below), whose sum is σ = 3685940476. Its totient is φ = 3685692384.

The previous prime is 3685816417. The next prime is 3685816439. The reversal of 3685816429 is 9246185863.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9246185863 = 23 ⋅402008081.

It can be written as a sum of positive squares in 2 ways, for example, as 3623438025 + 62378404 = 60195^2 + 7898^2 .

It is a cyclic number.

It is not a de Polignac number, because 3685816429 - 2⁷ = 3685816301 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 (3685816439) 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 3 ways as a sum of consecutive naturals, for example, 11977 + ... + 86689.

It is an arithmetic number, because the mean of its divisors is an integer number (921485119).

Almost surely, 2^3685816429 is an apocalyptic number.

It is an amenable number.

3685816429 is a deficient number, since it is larger than the sum of its proper divisors (124047).

3685816429 is an equidigital number, since it uses as much as digits as its factorization.

3685816429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124046.

The product of its digits is 2488320, while the sum is 52.

The square root of 3685816429 is about 60710.9251206074. The cubic root of 3685816429 is about 1544.7014960780.

The spelling of 3685816429 in words is "three billion, six hundred eighty-five million, eight hundred sixteen thousand, four hundred twenty-nine".