1898641 has 2 divisors, whose sum is σ = 1898642. Its totient is φ = 1898640.

The previous prime is 1898629. The next prime is 1898681. The reversal of 1898641 is 1468981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1795600 + 103041 = 1340^2 + 321^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898641 - 2⁵ = 1898609 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1898641.

It is not a weakly prime, because it can be changed into another prime (1898621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949320 + 949321.

It is an arithmetic number, because the mean of its divisors is an integer number (949321).

2^1898641 is an apocalyptic number.

It is an amenable number.

1898641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898641 is an equidigital number, since it uses as much as digits as its factorization.

1898641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 1898641 is about 1377.9118259163. The cubic root of 1898641 is about 123.8266959862.

The spelling of 1898641 in words is "one million, eight hundred ninety-eight thousand, six hundred forty-one".