1663433 has 4 divisors (see below), whose sum is σ = 1761300. Its totient is φ = 1565568.

The previous prime is 1663397. The next prime is 1663457. The reversal of 1663433 is 3343661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1364224 + 299209 = 1168^2 + 547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1663433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48908 + ... + 48941.

It is an arithmetic number, because the mean of its divisors is an integer number (440325).

2^1663433 is an apocalyptic number.

It is an amenable number.

1663433 is a deficient number, since it is larger than the sum of its proper divisors (97867).

1663433 is an equidigital number, since it uses as much as digits as its factorization.

1663433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97866.

The product of its digits is 3888, while the sum is 26.

The square root of 1663433 is about 1289.7414469575. The cubic root of 1663433 is about 118.4863817900.

The spelling of 1663433 in words is "one million, six hundred sixty-three thousand, four hundred thirty-three".