1898479459 has 2 divisors, whose sum is σ = 1898479460. Its totient is φ = 1898479458.

The previous prime is 1898479421. The next prime is 1898479469. The reversal of 1898479459 is 9549748981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1898479459 - 2⁹ = 1898478947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1898479459.

It is not a weakly prime, because it can be changed into another prime (1898479469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949239729 + 949239730.

It is an arithmetic number, because the mean of its divisors is an integer number (949239730).

Almost surely, 2^1898479459 is an apocalyptic number.

1898479459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1898479459 is an equidigital number, since it uses as much as digits as its factorization.

1898479459 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 64.

The square root of 1898479459 is about 43571.5441429381. The cubic root of 1898479459 is about 1238.2318406100.

The spelling of 1898479459 in words is "one billion, eight hundred ninety-eight million, four hundred seventy-nine thousand, four hundred fifty-nine".