1663380 has 36 divisors (see below), whose sum is σ = 5046132. Its totient is φ = 443520.

The previous prime is 1663379. The next prime is 1663381. The reversal of 1663380 is 833661.

It is an interprime number because it is at equal distance from previous prime (1663379) and next prime (1663381).

It can be written as a sum of positive squares in 2 ways, for example, as 1258884 + 404496 = 1122^2 + 636^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663381) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4441 + ... + 4800.

2^1663380 is an apocalyptic number.

1663380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1663380 is an abundant number, since it is smaller than the sum of its proper divisors (3382752).

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

1663380 is a wasteful number, since it uses less digits than its factorization.

1663380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9256 (or 9251 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 1663380 is about 1289.7209000400. The cubic root of 1663380 is about 118.4851233795.

The spelling of 1663380 in words is "one million, six hundred sixty-three thousand, three hundred eighty".