1998377936 has 20 divisors (see below), whose sum is σ = 4005370500. Its totient is φ = 964733952.

The previous prime is 1998377911. The next prime is 1998377947. The reversal of 1998377936 is 6397738991.

It can be written as a sum of positive squares in 2 ways, for example, as 831745600 + 1166632336 = 28840^2 + 34156^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2152961 + ... + 2153888.

It is an arithmetic number, because the mean of its divisors is an integer number (200268525).

Almost surely, 2^1998377936 is an apocalyptic number.

1998377936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1998377936 is an abundant number, since it is smaller than the sum of its proper divisors (2006992564).

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

1998377936 is a wasteful number, since it uses less digits than its factorization.

1998377936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306886 (or 4306880 counting only the distinct ones).

The product of its digits is 15431472, while the sum is 62.

The square root of 1998377936 is about 44703.2206446023. The cubic root of 1998377936 is about 1259.5803456746.

The spelling of 1998377936 in words is "one billion, nine hundred ninety-eight million, three hundred seventy-seven thousand, nine hundred thirty-six".