988439917 has 2 divisors, whose sum is σ = 988439918. Its totient is φ = 988439916.

The previous prime is 988439909. The next prime is 988439923. The reversal of 988439917 is 719934889.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 803098921 + 185340996 = 28339^2 + 13614^2 .

It is a cyclic number.

It is not a de Polignac number, because 988439917 - 2³ = 988439909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988439117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494219958 + 494219959.

It is an arithmetic number, because the mean of its divisors is an integer number (494219959).

Almost surely, 2^988439917 is an apocalyptic number.

It is an amenable number.

988439917 is a deficient number, since it is larger than the sum of its proper divisors (1).

988439917 is an equidigital number, since it uses as much as digits as its factorization.

988439917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 58.

The square root of 988439917 is about 31439.4643243170. The cubic root of 988439917 is about 996.1316945074.

The spelling of 988439917 in words is "nine hundred eighty-eight million, four hundred thirty-nine thousand, nine hundred seventeen".