1986629 has 2 divisors, whose sum is σ = 1986630. Its totient is φ = 1986628.

The previous prime is 1986601. The next prime is 1986631. The reversal of 1986629 is 9266891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1965604 + 21025 = 1402^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1986629 - 2⁸ = 1986373 is a prime.

It is a Sophie Germain prime.

Together with 1986631, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993314 + 993315.

It is an arithmetic number, because the mean of its divisors is an integer number (993315).

2^1986629 is an apocalyptic number.

It is an amenable number.

1986629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986629 is an equidigital number, since it uses as much as digits as its factorization.

1986629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 1986629 is about 1409.4782722696. The cubic root of 1986629 is about 125.7107035456.

The spelling of 1986629 in words is "one million, nine hundred eighty-six thousand, six hundred twenty-nine".