988406189 has 2 divisors, whose sum is σ = 988406190. Its totient is φ = 988406188.

The previous prime is 988406179. The next prime is 988406207. The reversal of 988406189 is 981604889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 768121225 + 220284964 = 27715^2 + 14842^2 .

It is a cyclic number.

It is not a de Polignac number, because 988406189 - 2¹⁶ = 988340653 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 988406189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988406179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494203094 + 494203095.

It is an arithmetic number, because the mean of its divisors is an integer number (494203095).

Almost surely, 2^988406189 is an apocalyptic number.

It is an amenable number.

988406189 is a deficient number, since it is larger than the sum of its proper divisors (1).

988406189 is an equidigital number, since it uses as much as digits as its factorization.

988406189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 988406189 is about 31438.9279238335. The cubic root of 988406189 is about 996.1203642245.

The spelling of 988406189 in words is "nine hundred eighty-eight million, four hundred six thousand, one hundred eighty-nine".