1669997 has 8 divisors (see below), whose sum is σ = 1940352. Its totient is φ = 1407600.

The previous prime is 1669979. The next prime is 1669999. The reversal of 1669997 is 7999661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1669997 - 2⁶ = 1669933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1529 + ... + 2382.

It is an arithmetic number, because the mean of its divisors is an integer number (242544).

2^1669997 is an apocalyptic number.

It is an amenable number.

1669997 is a deficient number, since it is larger than the sum of its proper divisors (270355).

1669997 is an equidigital number, since it uses as much as digits as its factorization.

1669997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3979.

The product of its digits is 183708, while the sum is 47.

The square root of 1669997 is about 1292.2836375966. The cubic root of 1669997 is about 118.6420285436.

The spelling of 1669997 in words is "one million, six hundred sixty-nine thousand, nine hundred ninety-seven".