1898849717 has 4 divisors (see below), whose sum is σ = 1898985036. Its totient is φ = 1898714400.

The previous prime is 1898849677. The next prime is 1898849737. The reversal of 1898849717 is 7179488981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1822094596 + 76755121 = 42686^2 + 8761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1898849717 - 2⁶ = 1898849653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1898849717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1898849737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43808 + ... + 75609.

It is an arithmetic number, because the mean of its divisors is an integer number (474746259).

Almost surely, 2^1898849717 is an apocalyptic number.

It is an amenable number.

1898849717 is a deficient number, since it is larger than the sum of its proper divisors (135319).

1898849717 is a wasteful number, since it uses less digits than its factorization.

1898849717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135318.

The product of its digits is 8128512, while the sum is 62.

The square root of 1898849717 is about 43575.7927868214. The cubic root of 1898849717 is about 1238.3123322971.

The spelling of 1898849717 in words is "one billion, eight hundred ninety-eight million, eight hundred forty-nine thousand, seven hundred seventeen".