1988198840 has 32 divisors (see below), whose sum is σ = 4513045680. Its totient is φ = 788239872.

The previous prime is 1988198831. The next prime is 1988198879. The reversal of 1988198840 is 488918891.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215414 + ... + 224453.

Almost surely, 2^1988198840 is an apocalyptic number.

1988198840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1988198840 is an abundant number, since it is smaller than the sum of its proper divisors (2524846840).

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

1988198840 is a wasteful number, since it uses less digits than its factorization.

1988198840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439991 (or 439987 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 56.

The square root of 1988198840 is about 44589.2233617048. The cubic root of 1988198840 is about 1257.4380714851.

The spelling of 1988198840 in words is "one billion, nine hundred eighty-eight million, one hundred ninety-eight thousand, eight hundred forty".