1998987190 has 32 divisors (see below), whose sum is σ = 3618061344. Its totient is φ = 795191040.

The previous prime is 1998987181. The next prime is 1998987191. The reversal of 1998987190 is 917898991.

It is a super-2 number, since 2×1998987190² = 7991899571568192200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998987191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2626410 + ... + 2627170.

It is an arithmetic number, because the mean of its divisors is an integer number (113064417).

Almost surely, 2^1998987190 is an apocalyptic number.

1998987190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1998987190 is a deficient number, since it is larger than the sum of its proper divisors (1619074154).

1998987190 is a wasteful number, since it uses less digits than its factorization.

1998987190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872.

The product of its (nonzero) digits is 2939328, while the sum is 61.

The square root of 1998987190 is about 44710.0345560144. The cubic root of 1998987190 is about 1259.7083372115.

The spelling of 1998987190 in words is "one billion, nine hundred ninety-eight million, nine hundred eighty-seven thousand, one hundred ninety".