1988111 has 4 divisors (see below), whose sum is σ = 2000472. Its totient is φ = 1975752.

The previous prime is 1988101. The next prime is 1988113. The reversal of 1988111 is 1118891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1118891 = 19 ⋅58889.

It is a cyclic number.

It is not a de Polignac number, because 1988111 - 2¹⁴ = 1971727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5936 + ... + 6261.

It is an arithmetic number, because the mean of its divisors is an integer number (500118).

2^1988111 is an apocalyptic number.

1988111 is a deficient number, since it is larger than the sum of its proper divisors (12361).

1988111 is a wasteful number, since it uses less digits than its factorization.

1988111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12360.

The product of its digits is 576, while the sum is 29.

The square root of 1988111 is about 1410.0039007038. The cubic root of 1988111 is about 125.7419553051.

The spelling of 1988111 in words is "one million, nine hundred eighty-eight thousand, one hundred eleven".