1663530 has 48 divisors (see below), whose sum is σ = 4417632. Its totient is φ = 397600.

The previous prime is 1663523. The next prime is 1663537. The reversal of 1663530 is 353661.

1663530 = T₁₈₀ + T₁₈₁ + ... + T₂₅₀.

It is an interprime number because it is at equal distance from previous prime (1663523) and next prime (1663537).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663530.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663537) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23395 + ... + 23465.

It is an arithmetic number, because the mean of its divisors is an integer number (92034).

2^1663530 is an apocalyptic number.

1663530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1663530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2208816).

1663530 is an abundant number, since it is smaller than the sum of its proper divisors (2754102).

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

1663530 is a wasteful number, since it uses less digits than its factorization.

1663530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163 (or 92 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 1663530 is about 1289.7790508455. The cubic root of 1663530 is about 118.4886848496.

It can be divided in two parts, 16 and 63530, that added together give a triangular number (63546 = T₃₅₆).

The spelling of 1663530 in words is "one million, six hundred sixty-three thousand, five hundred thirty".