1971898 has 16 divisors (see below), whose sum is σ = 3188160. Its totient is φ = 911296.

The previous prime is 1971889. The next prime is 1971901. The reversal of 1971898 is 8981791.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515 + ... + 2497.

It is an arithmetic number, because the mean of its divisors is an integer number (199260).

2^1971898 is an apocalyptic number.

1971898 is a deficient number, since it is larger than the sum of its proper divisors (1216262).

1971898 is a wasteful number, since it uses less digits than its factorization.

1971898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061.

The product of its digits is 36288, while the sum is 43.

The square root of 1971898 is about 1404.2428564889. The cubic root of 1971898 is about 125.3992143327.

It can be divided in two parts, 19 and 71898, that added together give a palindrome (71917).

The spelling of 1971898 in words is "one million, nine hundred seventy-one thousand, eight hundred ninety-eight".