1663963 has 8 divisors (see below), whose sum is σ = 2001920. Its totient is φ = 1351080.

The previous prime is 1663951. The next prime is 1663967. The reversal of 1663963 is 3693661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663963 is a prime.

It is a Duffinian number.

1663963 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6123 + ... + 6388.

It is an arithmetic number, because the mean of its divisors is an integer number (250240).

2^1663963 is an apocalyptic number.

1663963 is a deficient number, since it is larger than the sum of its proper divisors (337957).

1663963 is a wasteful number, since it uses less digits than its factorization.

1663963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12537.

The product of its digits is 17496, while the sum is 34.

The square root of 1663963 is about 1289.9468981319. The cubic root of 1663963 is about 118.4989644257.

The spelling of 1663963 in words is "one million, six hundred sixty-three thousand, nine hundred sixty-three".