1663626 has 16 divisors (see below), whose sum is σ = 3348000. Its totient is φ = 551088.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663626 is 6263661.

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1663593 and 1663602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300 + ... + 1848.

It is an arithmetic number, because the mean of its divisors is an integer number (209250).

2^1663626 is an apocalyptic number.

1663626 is an abundant number, since it is smaller than the sum of its proper divisors (1684374).

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

1663626 is a wasteful number, since it uses less digits than its factorization.

1663626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1733.

The product of its digits is 7776, while the sum is 30.

The square root of 1663626 is about 1289.8162659852. The cubic root of 1663626 is about 118.4909640780.

The spelling of 1663626 in words is "one million, six hundred sixty-three thousand, six hundred twenty-six".