1663927 has 4 divisors (see below), whose sum is σ = 1708936. Its totient is φ = 1618920.

The previous prime is 1663919. The next prime is 1663951. The reversal of 1663927 is 7293661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7293661 = 223 ⋅32707.

It is a cyclic number.

It is not a de Polignac number, because 1663927 - 2³ = 1663919 is a prime.

It is a super-2 number, since 2×1663927² = 5537306122658, which contains 22 as substring.

It is a Duffinian number.

1663927 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1663892 and 1663901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663967) 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 3 ways as a sum of consecutive naturals, for example, 22449 + ... + 22522.

It is an arithmetic number, because the mean of its divisors is an integer number (427234).

2^1663927 is an apocalyptic number.

1663927 is a deficient number, since it is larger than the sum of its proper divisors (45009).

1663927 is an equidigital number, since it uses as much as digits as its factorization.

1663927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45008.

The product of its digits is 13608, while the sum is 34.

The square root of 1663927 is about 1289.9329439936. The cubic root of 1663927 is about 118.4981098407.

The spelling of 1663927 in words is "one million, six hundred sixty-three thousand, nine hundred twenty-seven".