1663480 has 64 divisors (see below), whose sum is σ = 4616640. Its totient is φ = 525312.

The previous prime is 1663477. The next prime is 1663481. The reversal of 1663480 is 843661.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663481) 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 15 ways as a sum of consecutive naturals, for example, 3412 + ... + 3868.

It is an arithmetic number, because the mean of its divisors is an integer number (72135).

2^1663480 is an apocalyptic number.

1663480 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 1663480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2308320).

1663480 is an abundant number, since it is smaller than the sum of its proper divisors (2953160).

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

1663480 is a wasteful number, since it uses less digits than its factorization.

1663480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488 (or 484 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 1663480 is about 1289.7596675350. The cubic root of 1663480 is about 118.4874977166.

The spelling of 1663480 in words is "one million, six hundred sixty-three thousand, four hundred eighty".