3992689 has 2 divisors, whose sum is σ = 3992690. Its totient is φ = 3992688.

The previous prime is 3992687. The next prime is 3992699. The reversal of 3992689 is 9862993.

3992689 = T₁₆₃₀ + T₁₆₃₁ + T₁₆₃₂.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2958400 + 1034289 = 1720^2 + 1017^2 .

It is a cyclic number.

It is not a de Polignac number, because 3992689 - 2¹ = 3992687 is a prime.

Together with 3992687, it forms a pair of twin primes.

3992689 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3992683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996344 + 1996345.

It is an arithmetic number, because the mean of its divisors is an integer number (1996345).

Almost surely, 2^3992689 is an apocalyptic number.

3992689 is the 1632-nd centered triangular number.

It is an amenable number.

3992689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3992689 is an equidigital number, since it uses as much as digits as its factorization.

3992689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 46.

The square root of 3992689 is about 1998.1714140684. The cubic root of 3992689 is about 158.6433338058.

The spelling of 3992689 in words is "three million, nine hundred ninety-two thousand, six hundred eighty-nine".