1663240 has 32 divisors (see below), whose sum is σ = 3833280. Its totient is φ = 649152.

The previous prime is 1663223. The next prime is 1663267. The reversal of 1663240 is 423661.

It is a d-powerful number, because it can be written as 1 + 6² + 6⁴ + 3¹³ + 2¹¹ + 4⁸ + 0 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1237 + ... + 2203.

It is an arithmetic number, because the mean of its divisors is an integer number (119790).

2^1663240 is an apocalyptic number.

1663240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1916640).

1663240 is an abundant number, since it is smaller than the sum of its proper divisors (2170040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1663240 is a wasteful number, since it uses less digits than its factorization.

1663240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1663240 is about 1289.6666235892. Note that the first 4 decimals coincide. The cubic root of 1663240 is about 118.4817991476.

The spelling of 1663240 in words is "one million, six hundred sixty-three thousand, two hundred forty".