988657 has 4 divisors (see below), whose sum is σ = 996336. Its totient is φ = 980980.

The previous prime is 988651. The next prime is 988661. The reversal of 988657 is 756889.

It is a happy number.

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: 756889 = 7 ⋅108127.

It is a cyclic number.

It is not a de Polignac number, because 988657 - 2³ = 988649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (988651) 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, 3643 + ... + 3904.

It is an arithmetic number, because the mean of its divisors is an integer number (249084).

2⁹⁸⁸⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

988657 is a deficient number, since it is larger than the sum of its proper divisors (7679).

988657 is a wasteful number, since it uses less digits than its factorization.

988657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7678.

The product of its digits is 120960, while the sum is 43.

The square root of 988657 is about 994.3123251776. The cubic root of 988657 is about 99.6204613264.

The spelling of 988657 in words is "nine hundred eighty-eight thousand, six hundred fifty-seven".