1664269 has 4 divisors (see below), whose sum is σ = 1667196. Its totient is φ = 1661344.

The previous prime is 1664261. The next prime is 1664279. The reversal of 1664269 is 9624661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 1550025 = 338^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664269 - 2³ = 1664261 is a prime.

It is a super-2 number, since 2×1664269² = 5539582608722, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304 + ... + 1849.

It is an arithmetic number, because the mean of its divisors is an integer number (416799).

2^1664269 is an apocalyptic number.

It is an amenable number.

1664269 is a deficient number, since it is larger than the sum of its proper divisors (2927).

1664269 is an equidigital number, since it uses as much as digits as its factorization.

1664269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926.

The product of its digits is 15552, while the sum is 34.

The square root of 1664269 is about 1290.0655022130. The cubic root of 1664269 is about 118.5062279006.

The spelling of 1664269 in words is "one million, six hundred sixty-four thousand, two hundred sixty-nine".