988997 has 4 divisors (see below), whose sum is σ = 991020. Its totient is φ = 986976.

The previous prime is 988979. The next prime is 989011. The reversal of 988997 is 799889.

Added to its reverse (799889) it gives a triangular number (1788886 = T₁₈₉₁).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 799889 = 233 ⋅3433.

It can be written as a sum of positive squares in 2 ways, for example, as 538756 + 450241 = 734^2 + 671^2 .

It is a cyclic number.

It is not a de Polignac number, because 988997 - 2¹⁴ = 972613 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 (988937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (247755).

2⁹⁸⁸⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

988997 is a deficient number, since it is larger than the sum of its proper divisors (2023).

988997 is a wasteful number, since it uses less digits than its factorization.

988997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2022.

The product of its digits is 326592, while the sum is 50.

The square root of 988997 is about 994.4832829163. The cubic root of 988997 is about 99.6318798719.

Adding to 988997 its reverse (799889), we get a triangular number (1788886 = T₁₈₉₁).

The spelling of 988997 in words is "nine hundred eighty-eight thousand, nine hundred ninety-seven".