1663799 has 4 divisors (see below), whose sum is σ = 1702536. Its totient is φ = 1625064.

The previous prime is 1663793. The next prime is 1663813. The reversal of 1663799 is 9973661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1663799 - 2¹⁶ = 1598263 is a prime.

It is a super-2 number, since 2×1663799² = 5536454224802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663793) 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, 19304 + ... + 19389.

It is an arithmetic number, because the mean of its divisors is an integer number (425634).

2^1663799 is an apocalyptic number.

1663799 is a deficient number, since it is larger than the sum of its proper divisors (38737).

1663799 is an equidigital number, since it uses as much as digits as its factorization.

1663799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38736.

The product of its digits is 61236, while the sum is 41.

The square root of 1663799 is about 1289.8833280572. The cubic root of 1663799 is about 118.4950712164.

The spelling of 1663799 in words is "one million, six hundred sixty-three thousand, seven hundred ninety-nine".