1998957822 has 16 divisors (see below), whose sum is σ = 4013474832. Its totient is φ = 663726080.

The previous prime is 1998957817. The next prime is 1998957823. The reversal of 1998957822 is 2287598991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998957823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646629 + ... + 649712.

It is an arithmetic number, because the mean of its divisors is an integer number (250842177).

Almost surely, 2^1998957822 is an apocalyptic number.

1998957822 is an abundant number, since it is smaller than the sum of its proper divisors (2014517010).

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

1998957822 is a wasteful number, since it uses less digits than its factorization.

1998957822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296603.

The product of its digits is 6531840, while the sum is 60.

The square root of 1998957822 is about 44709.7061274171. The cubic root of 1998957822 is about 1259.7021682049.

The spelling of 1998957822 in words is "one billion, nine hundred ninety-eight million, nine hundred fifty-seven thousand, eight hundred twenty-two".