1669897 has 2 divisors, whose sum is σ = 1669898. Its totient is φ = 1669896.

The previous prime is 1669883. The next prime is 1669931. The reversal of 1669897 is 7989661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1610361 + 59536 = 1269^2 + 244^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1669897 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834948 + 834949.

It is an arithmetic number, because the mean of its divisors is an integer number (834949).

2^1669897 is an apocalyptic number.

It is an amenable number.

1669897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669897 is an equidigital number, since it uses as much as digits as its factorization.

1669897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 46.

The square root of 1669897 is about 1292.2449458210. The cubic root of 1669897 is about 118.6396603878.

The spelling of 1669897 in words is "one million, six hundred sixty-nine thousand, eight hundred ninety-seven".