1988533 has 2 divisors, whose sum is σ = 1988534. Its totient is φ = 1988532.

The previous prime is 1988531. The next prime is 1988537. The reversal of 1988533 is 3358891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1495729 + 492804 = 1223^2 + 702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988533 - 2¹ = 1988531 is a prime.

Together with 1988531, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1988492 and 1988501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994266 + 994267.

It is an arithmetic number, because the mean of its divisors is an integer number (994267).

2^1988533 is an apocalyptic number.

It is an amenable number.

1988533 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988533 is an equidigital number, since it uses as much as digits as its factorization.

1988533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 1988533 is about 1410.1535377398. The cubic root of 1988533 is about 125.7508514132.

The spelling of 1988533 in words is "one million, nine hundred eighty-eight thousand, five hundred thirty-three".