988999 has 4 divisors (see below), whose sum is σ = 1078920. Its totient is φ = 899080.

The previous prime is 988979. The next prime is 989011. The reversal of 988999 is 999889.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 988999 - 2¹⁵ = 956231 is a prime.

It is a Duffinian number.

988999 is a modest number, since divided by 999 gives 988 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988909) 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, 44944 + ... + 44965.

It is an arithmetic number, because the mean of its divisors is an integer number (269730).

2⁹⁸⁸⁹⁹⁹ is an apocalyptic number.

988999 is a deficient number, since it is larger than the sum of its proper divisors (89921).

988999 is a wasteful number, since it uses less digits than its factorization.

988999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89920.

The product of its digits is 419904, while the sum is 52.

The square root of 988999 is about 994.4842884631. The cubic root of 988999 is about 99.6319470320.

The spelling of 988999 in words is "nine hundred eighty-eight thousand, nine hundred ninety-nine".