1663418 has 4 divisors (see below), whose sum is σ = 2495130. Its totient is φ = 831708.

The previous prime is 1663397. The next prime is 1663457. The reversal of 1663418 is 8143661.

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

It can be written as a sum of positive squares in only one way, i.e., 1481089 + 182329 = 1217^2 + 427^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 415853 + ... + 415856.

2^1663418 is an apocalyptic number.

1663418 is a deficient number, since it is larger than the sum of its proper divisors (831712).

1663418 is an equidigital number, since it uses as much as digits as its factorization.

1663418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831711.

The product of its digits is 3456, while the sum is 29.

The square root of 1663418 is about 1289.7356318254. The cubic root of 1663418 is about 118.4860256388.

The spelling of 1663418 in words is "one million, six hundred sixty-three thousand, four hundred eighteen".