1649887 has 2 divisors, whose sum is σ = 1649888. Its totient is φ = 1649886.

The previous prime is 1649863. The next prime is 1649917. The reversal of 1649887 is 7889461.

It is a weak prime.

It is an emirp because it is prime and its reverse (7889461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1649887 - 2⁷ = 1649759 is a prime.

It is a super-2 number, since 2×1649887² = 5444254225538, which contains 22 as substring.

It is an Ulam number.

1649887 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649807) 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 as a sum of consecutive naturals, namely, 824943 + 824944.

It is an arithmetic number, because the mean of its divisors is an integer number (824944).

2^1649887 is an apocalyptic number.

1649887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649887 is an equidigital number, since it uses as much as digits as its factorization.

1649887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 1649887 is about 1284.4792719231. The cubic root of 1649887 is about 118.1638774452.

The spelling of 1649887 in words is "one million, six hundred forty-nine thousand, eight hundred eighty-seven".