1868641 has 2 divisors, whose sum is σ = 1868642. Its totient is φ = 1868640.

The previous prime is 1868639. The next prime is 1868663. The reversal of 1868641 is 1468681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1766241 + 102400 = 1329^2 + 320^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868641 - 2¹ = 1868639 is a prime.

Together with 1868639, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1868597 and 1868606.

It is not a weakly prime, because it can be changed into another prime (1860641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934320 + 934321.

It is an arithmetic number, because the mean of its divisors is an integer number (934321).

2^1868641 is an apocalyptic number.

It is an amenable number.

1868641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868641 is an equidigital number, since it uses as much as digits as its factorization.

1868641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 34.

The square root of 1868641 is about 1366.9824431938. The cubic root of 1868641 is about 123.1710445600.

The spelling of 1868641 in words is "one million, eight hundred sixty-eight thousand, six hundred forty-one".