1669397 has 8 divisors (see below), whose sum is σ = 1800960. Its totient is φ = 1542240.

The previous prime is 1669391. The next prime is 1669399. The reversal of 1669397 is 7939661.

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 1669397 - 2⁸ = 1669141 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1669391) 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 in 7 ways as a sum of consecutive naturals, for example, 293 + ... + 1850.

It is an arithmetic number, because the mean of its divisors is an integer number (225120).

2^1669397 is an apocalyptic number.

It is an amenable number.

1669397 is a deficient number, since it is larger than the sum of its proper divisors (131563).

1669397 is a wasteful number, since it uses less digits than its factorization.

1669397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203.

The product of its digits is 61236, while the sum is 41.

The square root of 1669397 is about 1292.0514695630. The cubic root of 1669397 is about 118.6278181900.

The spelling of 1669397 in words is "one million, six hundred sixty-nine thousand, three hundred ninety-seven".