196278457 has 2 divisors, whose sum is σ = 196278458. Its totient is φ = 196278456.

The previous prime is 196278421. The next prime is 196278463. The reversal of 196278457 is 754872691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124300201 + 71978256 = 11149^2 + 8484^2 .

It is a cyclic number.

It is not a de Polignac number, because 196278457 - 2¹⁵ = 196245689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196278457.

It is not a weakly prime, because it can be changed into another prime (196278487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98139228 + 98139229.

It is an arithmetic number, because the mean of its divisors is an integer number (98139229).

Almost surely, 2^196278457 is an apocalyptic number.

It is an amenable number.

196278457 is a deficient number, since it is larger than the sum of its proper divisors (1).

196278457 is an equidigital number, since it uses as much as digits as its factorization.

196278457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The square root of 196278457 is about 14009.9413631892. The cubic root of 196278457 is about 581.1535277205.

The spelling of 196278457 in words is "one hundred ninety-six million, two hundred seventy-eight thousand, four hundred fifty-seven".