1669294449 has 9 divisors (see below), whose sum is σ = 2411380153. Its totient is φ = 1112781252.

The previous prime is 1669294409. The next prime is 1669294559. The reversal of 1669294449 is 9444929661.

It is a happy number.

The square root of 1669294449 is 40857.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1669294449 - 2⁷ = 1669294321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1669294395 and 1669294404.

It is not an unprimeable number, because it can be changed into a prime (1669294409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 115762 + ... + 129380.

Almost surely, 2^1669294449 is an apocalyptic number.

1669294449 is the 40857-th square number.

1669294449 is the 20429-th centered octagonal number.

It is an amenable number.

1669294449 is a deficient number, since it is larger than the sum of its proper divisors (742085704).

1669294449 is an frugal number, since it uses more digits than its factorization.

1669294449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27244 (or 13622 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The cubic root of 1669294449 is about 1186.2538903930.

The spelling of 1669294449 in words is "one billion, six hundred sixty-nine million, two hundred ninety-four thousand, four hundred forty-nine".