398442251 has 2 divisors, whose sum is σ = 398442252. Its totient is φ = 398442250.

The previous prime is 398442211. The next prime is 398442269. The reversal of 398442251 is 152244893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398442251 is a prime.

It is not a weakly prime, because it can be changed into another prime (398442211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199221125 + 199221126.

It is an arithmetic number, because the mean of its divisors is an integer number (199221126).

Almost surely, 2^398442251 is an apocalyptic number.

398442251 is a deficient number, since it is larger than the sum of its proper divisors (1).

398442251 is an equidigital number, since it uses as much as digits as its factorization.

398442251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 398442251 is about 19961.0182856487. The cubic root of 398442251 is about 735.8485893593.

The spelling of 398442251 in words is "three hundred ninety-eight million, four hundred forty-two thousand, two hundred fifty-one".