1669969 has 12 divisors (see below), whose sum is σ = 1963764. Its totient is φ = 1415904.

The previous prime is 1669963. The next prime is 1669979. The reversal of 1669969 is 9699661.

It can be written as a sum of positive squares in 2 ways, for example, as 1587600 + 82369 = 1260^2 + 287^2 .

It is not a de Polignac number, because 1669969 - 2⁵ = 1669937 is a prime.

It is a super-2 number, since 2×1669969² = 5577592921922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669963) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8379 + ... + 8575.

It is an arithmetic number, because the mean of its divisors is an integer number (163647).

2^1669969 is an apocalyptic number.

It is an amenable number.

1669969 is a deficient number, since it is larger than the sum of its proper divisors (293795).

1669969 is a wasteful number, since it uses less digits than its factorization.

1669969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 377 counting only the distinct ones).

The product of its digits is 157464, while the sum is 46.

The square root of 1669969 is about 1292.2728040162. The cubic root of 1669969 is about 118.6413654695.

The spelling of 1669969 in words is "one million, six hundred sixty-nine thousand, nine hundred sixty-nine".