1649863 has 2 divisors, whose sum is σ = 1649864. Its totient is φ = 1649862.

The previous prime is 1649861. The next prime is 1649887. The reversal of 1649863 is 3689461.

It is a weak prime.

It is an emirp because it is prime and its reverse (3689461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649863 - 2¹ = 1649861 is a prime.

Together with 1649861, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824931 + 824932.

It is an arithmetic number, because the mean of its divisors is an integer number (824932).

2^1649863 is an apocalyptic number.

1649863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649863 is an equidigital number, since it uses as much as digits as its factorization.

1649863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 1649863 is about 1284.4699295818. The cubic root of 1649863 is about 118.1633044874.

It can be divided in two parts, 16498 and 63, that added together give a palindrome (16561).

The spelling of 1649863 in words is "one million, six hundred forty-nine thousand, eight hundred sixty-three".