1898617985 has 16 divisors (see below), whose sum is σ = 2526213312. Its totient is φ = 1358174400.

The previous prime is 1898617939. The next prime is 1898617999. The reversal of 1898617985 is 5897168981.

It is not a de Polignac number, because 1898617985 - 2¹⁸ = 1898355841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279599 + ... + 286308.

It is an arithmetic number, because the mean of its divisors is an integer number (157888332).

Almost surely, 2^1898617985 is an apocalyptic number.

It is an amenable number.

1898617985 is a deficient number, since it is larger than the sum of its proper divisors (627595327).

1898617985 is a wasteful number, since it uses less digits than its factorization.

1898617985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565984.

The product of its digits is 8709120, while the sum is 62.

The square root of 1898617985 is about 43573.1337523479. The cubic root of 1898617985 is about 1238.2619564889.

The spelling of 1898617985 in words is "one billion, eight hundred ninety-eight million, six hundred seventeen thousand, nine hundred eighty-five".