398131229 has 2 divisors, whose sum is σ = 398131230. Its totient is φ = 398131228.

The previous prime is 398131189. The next prime is 398131231. The reversal of 398131229 is 922131893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394022500 + 4108729 = 19850^2 + 2027^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398131229 is a prime.

Together with 398131231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 398131192 and 398131201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398131259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199065614 + 199065615.

It is an arithmetic number, because the mean of its divisors is an integer number (199065615).

Almost surely, 2^398131229 is an apocalyptic number.

It is an amenable number.

398131229 is a deficient number, since it is larger than the sum of its proper divisors (1).

398131229 is an equidigital number, since it uses as much as digits as its factorization.

398131229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 398131229 is about 19953.2260298930. The cubic root of 398131229 is about 735.6570729596.

The spelling of 398131229 in words is "three hundred ninety-eight million, one hundred thirty-one thousand, two hundred twenty-nine".