1664419 has 8 divisors (see below), whose sum is σ = 1855440. Its totient is φ = 1483776.

The previous prime is 1664417. The next prime is 1664431. The reversal of 1664419 is 9144661.

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

It is a 10-Lehmer number, since φ(1664419) divides (1664419-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 1664419 - 2¹ = 1664417 is a prime.

It is a super-2 number, since 2×1664419² = 5540581215122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664417) 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, 2254 + ... + 2899.

It is an arithmetic number, because the mean of its divisors is an integer number (231930).

2^1664419 is an apocalyptic number.

1664419 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1664419 is a deficient number, since it is larger than the sum of its proper divisors (191021).

1664419 is a wasteful number, since it uses less digits than its factorization.

1664419 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5189.

The product of its digits is 5184, while the sum is 31.

The square root of 1664419 is about 1290.1236374860. The cubic root of 1664419 is about 118.5097881023.

The spelling of 1664419 in words is "one million, six hundred sixty-four thousand, four hundred nineteen".