1663493 has 8 divisors (see below), whose sum is σ = 1835736. Its totient is φ = 1497600.

The previous prime is 1663481. The next prime is 1663513. The reversal of 1663493 is 3943661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 334084 + 1329409 = 578^2 + 1153^2 .

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

It is not a de Polignac number, because 1663493 - 2⁴ = 1663477 is a prime.

It is a super-2 number, since 2×1663493² = 5534417922098, 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 (1663463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028 + ... + 2093.

It is an arithmetic number, because the mean of its divisors is an integer number (229467).

2^1663493 is an apocalyptic number.

1663493 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1663493 is a deficient number, since it is larger than the sum of its proper divisors (172243).

1663493 is a wasteful number, since it uses less digits than its factorization.

1663493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3175.

The product of its digits is 11664, while the sum is 32.

The square root of 1663493 is about 1289.7647072238. The cubic root of 1663493 is about 118.4878063735.

The spelling of 1663493 in words is "one million, six hundred sixty-three thousand, four hundred ninety-three".