999971898 has 16 divisors (see below), whose sum is σ = 2064458496. Its totient is φ = 322571520.

The previous prime is 999971849. The next prime is 999971899. The reversal of 999971898 is 898179999.

It is not an unprimeable number, because it can be changed into a prime (999971899) 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 in 7 ways as a sum of consecutive naturals, for example, 2687911 + ... + 2688282.

It is an arithmetic number, because the mean of its divisors is an integer number (129028656).

Almost surely, 2^999971898 is an apocalyptic number.

999971898 is an abundant number, since it is smaller than the sum of its proper divisors (1064486598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999971898 is a wasteful number, since it uses less digits than its factorization.

999971898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5376229.

The product of its digits is 26453952, while the sum is 69.

The square root of 999971898 is about 31622.3322669281. The cubic root of 999971898 is about 999.9906325789.

The spelling of 999971898 in words is "nine hundred ninety-nine million, nine hundred seventy-one thousand, eight hundred ninety-eight".