1988521 has 4 divisors (see below), whose sum is σ = 2093200. Its totient is φ = 1883844.

The previous prime is 1988513. The next prime is 1988531. The reversal of 1988521 is 1258891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1258891 = 757 ⋅1663.

It is a cyclic number.

It is not a de Polignac number, because 1988521 - 2³ = 1988513 is a prime.

It is a Duffinian number.

1988521 is a lucky number.

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 3 ways as a sum of consecutive naturals, for example, 52311 + ... + 52348.

It is an arithmetic number, because the mean of its divisors is an integer number (523300).

2^1988521 is an apocalyptic number.

It is an amenable number.

1988521 is a deficient number, since it is larger than the sum of its proper divisors (104679).

1988521 is a wasteful number, since it uses less digits than its factorization.

1988521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104678.

The product of its digits is 5760, while the sum is 34.

The square root of 1988521 is about 1410.1492828775. The cubic root of 1988521 is about 125.7505984607.

The spelling of 1988521 in words is "one million, nine hundred eighty-eight thousand, five hundred twenty-one".