1928287 has 2 divisors, whose sum is σ = 1928288. Its totient is φ = 1928286.

The previous prime is 1928261. The next prime is 1928317. The reversal of 1928287 is 7828291.

It is a weak prime.

It is an emirp because it is prime and its reverse (7828291) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1928287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1928207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 964143 + 964144.

It is an arithmetic number, because the mean of its divisors is an integer number (964144).

2^1928287 is an apocalyptic number.

1928287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1928287 is an equidigital number, since it uses as much as digits as its factorization.

1928287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 1928287 is about 1388.6277398929. The cubic root of 1928287 is about 124.4678605018.

The spelling of 1928287 in words is "one million, nine hundred twenty-eight thousand, two hundred eighty-seven".