988409 has 2 divisors, whose sum is σ = 988410. Its totient is φ = 988408.

The previous prime is 988367. The next prime is 988417. The reversal of 988409 is 904889.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 765625 + 222784 = 875^2 + 472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988409 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (988439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494204 + 494205.

It is an arithmetic number, because the mean of its divisors is an integer number (494205).

2⁹⁸⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

988409 is a deficient number, since it is larger than the sum of its proper divisors (1).

988409 is an equidigital number, since it uses as much as digits as its factorization.

988409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 988409 is about 994.1876080499. The cubic root of 988409 is about 99.6121308537.

The spelling of 988409 in words is "nine hundred eighty-eight thousand, four hundred nine".