398885129 has 2 divisors, whose sum is σ = 398885130. Its totient is φ = 398885128.

The previous prime is 398885117. The next prime is 398885143. The reversal of 398885129 is 921588893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222606400 + 176278729 = 14920^2 + 13277^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398885129 is a prime.

It is a super-2 number, since 2×398885129² = 318218692274693282, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (398885189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199442564 + 199442565.

It is an arithmetic number, because the mean of its divisors is an integer number (199442565).

Almost surely, 2^398885129 is an apocalyptic number.

It is an amenable number.

398885129 is a deficient number, since it is larger than the sum of its proper divisors (1).

398885129 is an equidigital number, since it uses as much as digits as its factorization.

398885129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 53.

The square root of 398885129 is about 19972.1087769920. The cubic root of 398885129 is about 736.1211261196.

The spelling of 398885129 in words is "three hundred ninety-eight million, eight hundred eighty-five thousand, one hundred twenty-nine".