1649287 has 2 divisors, whose sum is σ = 1649288. Its totient is φ = 1649286.

The previous prime is 1649267. The next prime is 1649299. The reversal of 1649287 is 7829461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1649287 - 2¹⁵ = 1616519 is a prime.

1649287 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1649237) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 824643 + 824644.

It is an arithmetic number, because the mean of its divisors is an integer number (824644).

2^1649287 is an apocalyptic number.

1649287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1649287 is an equidigital number, since it uses as much as digits as its factorization.

1649287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 1649287 is about 1284.2456930043. The cubic root of 1649287 is about 118.1495518333.

It can be divided in two parts, 1649 and 287, that added together give a square (1936 = 44²).

The spelling of 1649287 in words is "one million, six hundred forty-nine thousand, two hundred eighty-seven".