1663959 has 8 divisors (see below), whose sum is σ = 2420352. Its totient is φ = 1008440.

The previous prime is 1663951. The next prime is 1663967. The reversal of 1663959 is 9593661.

It is an interprime number because it is at equal distance from previous prime (1663951) and next prime (1663967).

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

It is a cyclic number.

It is not a de Polignac number, because 1663959 - 2³ = 1663951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663951) 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, 25179 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (302544).

2^1663959 is an apocalyptic number.

1663959 is a deficient number, since it is larger than the sum of its proper divisors (756393).

1663959 is a wasteful number, since it uses less digits than its factorization.

1663959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50437.

The product of its digits is 43740, while the sum is 39.

The square root of 1663959 is about 1289.9453476795. The cubic root of 1663959 is about 118.4988694724.

The spelling of 1663959 in words is "one million, six hundred sixty-three thousand, nine hundred fifty-nine".