198428057 has 2 divisors, whose sum is σ = 198428058. Its totient is φ = 198428056.

The previous prime is 198427973. The next prime is 198428099. The reversal of 198428057 is 750824891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196308121 + 2119936 = 14011^2 + 1456^2 .

It is an emirp because it is prime and its reverse (750824891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198428057 - 2¹⁴ = 198411673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198427999 and 198428017.

It is not a weakly prime, because it can be changed into another prime (198428357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99214028 + 99214029.

It is an arithmetic number, because the mean of its divisors is an integer number (99214029).

Almost surely, 2^198428057 is an apocalyptic number.

It is an amenable number.

198428057 is a deficient number, since it is larger than the sum of its proper divisors (1).

198428057 is an equidigital number, since it uses as much as digits as its factorization.

198428057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 198428057 is about 14086.4494106925. The cubic root of 198428057 is about 583.2673862500.

The spelling of 198428057 in words is "one hundred ninety-eight million, four hundred twenty-eight thousand, fifty-seven".