398885117 has 2 divisors, whose sum is σ = 398885118. Its totient is φ = 398885116.

The previous prime is 398885101. The next prime is 398885129. The reversal of 398885117 is 711588893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 358193476 + 40691641 = 18926^2 + 6379^2 .

It is a cyclic number.

It is not a de Polignac number, because 398885117 - 2⁴ = 398885101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398885147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199442558 + 199442559.

It is an arithmetic number, because the mean of its divisors is an integer number (199442559).

Almost surely, 2^398885117 is an apocalyptic number.

It is an amenable number.

398885117 is a deficient number, since it is larger than the sum of its proper divisors (1).

398885117 is an equidigital number, since it uses as much as digits as its factorization.

398885117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 50.

The square root of 398885117 is about 19972.1084765730. The cubic root of 398885117 is about 736.1211187378.

The spelling of 398885117 in words is "three hundred ninety-eight million, eight hundred eighty-five thousand, one hundred seventeen".