1646629 has 2 divisors, whose sum is σ = 1646630. Its totient is φ = 1646628.

The previous prime is 1646609. The next prime is 1646633. The reversal of 1646629 is 9266461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 277729 = 1170^2 + 527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646629 is a prime.

It is a super-2 number, since 2×1646629² = 5422774127282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646594 and 1646603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823314 + 823315.

It is an arithmetic number, because the mean of its divisors is an integer number (823315).

2^1646629 is an apocalyptic number.

It is an amenable number.

1646629 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646629 is an equidigital number, since it uses as much as digits as its factorization.

1646629 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 1646629 is about 1283.2104270150. The cubic root of 1646629 is about 118.0860475506.

The spelling of 1646629 in words is "one million, six hundred forty-six thousand, six hundred twenty-nine".