1988530 has 16 divisors (see below), whose sum is σ = 3703320. Its totient is φ = 767872.

The previous prime is 1988513. The next prime is 1988531. The reversal of 1988530 is 358891.

It can be written as a sum of positive squares in 4 ways, for example, as 962361 + 1026169 = 981^2 + 1013^2 .

It is not an unprimeable number, because it can be changed into a prime (1988531) by changing a digit.

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, 3139 + ... + 3718.

2^1988530 is an apocalyptic number.

1988530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1988530 is a deficient number, since it is larger than the sum of its proper divisors (1714790).

1988530 is a wasteful number, since it uses less digits than its factorization.

1988530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1988530 is about 1410.1524740254. The cubic root of 1988530 is about 125.7507881752.

The spelling of 1988530 in words is "one million, nine hundred eighty-eight thousand, five hundred thirty".