1663040 has 28 divisors (see below), whose sum is σ = 3960876. Its totient is φ = 665088.

The previous prime is 1663031. The next prime is 1663073. The reversal of 1663040 is 403661.

It can be written as a sum of positive squares in 2 ways, for example, as 678976 + 984064 = 824^2 + 992^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2279 + ... + 2918.

2^1663040 is an apocalyptic number.

1663040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663040 is an abundant number, since it is smaller than the sum of its proper divisors (2297836).

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

1663040 is an equidigital number, since it uses as much as digits as its factorization.

1663040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5214 (or 5204 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1663040 is about 1289.5890818396. The cubic root of 1663040 is about 118.4770499212.

The spelling of 1663040 in words is "one million, six hundred sixty-three thousand, forty".