1843649 has 2 divisors, whose sum is σ = 1843650. Its totient is φ = 1843648.

The previous prime is 1843643. The next prime is 1843687. The reversal of 1843649 is 9463481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1803649 + 40000 = 1343^2 + 200^2 .

It is an emirp because it is prime and its reverse (9463481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1843649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1843643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921824 + 921825.

It is an arithmetic number, because the mean of its divisors is an integer number (921825).

2^1843649 is an apocalyptic number.

It is an amenable number.

1843649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843649 is an equidigital number, since it uses as much as digits as its factorization.

1843649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 1843649 is about 1357.8103696761. The cubic root of 1843649 is about 122.6194641888.

The spelling of 1843649 in words is "one million, eight hundred forty-three thousand, six hundred forty-nine".