1798649 has 2 divisors, whose sum is σ = 1798650. Its totient is φ = 1798648.

The previous prime is 1798639. The next prime is 1798679. The reversal of 1798649 is 9468971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488400 + 310249 = 1220^2 + 557^2 .

It is an emirp because it is prime and its reverse (9468971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1798649 - 2⁴ = 1798633 is a prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899324 + 899325.

It is an arithmetic number, because the mean of its divisors is an integer number (899325).

2^1798649 is an apocalyptic number.

It is an amenable number.

1798649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798649 is an equidigital number, since it uses as much as digits as its factorization.

1798649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 1798649 is about 1341.1372040175. The cubic root of 1798649 is about 121.6135987576.

The spelling of 1798649 in words is "one million, seven hundred ninety-eight thousand, six hundred forty-nine".