194403457 has 2 divisors, whose sum is σ = 194403458. Its totient is φ = 194403456.

The previous prime is 194403431. The next prime is 194403463. The reversal of 194403457 is 754304491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119771136 + 74632321 = 10944^2 + 8639^2 .

It is a cyclic number.

It is not a de Polignac number, because 194403457 - 2⁷ = 194403329 is a prime.

It is not a weakly prime, because it can be changed into another prime (194403757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97201728 + 97201729.

It is an arithmetic number, because the mean of its divisors is an integer number (97201729).

Almost surely, 2^194403457 is an apocalyptic number.

It is an amenable number.

194403457 is a deficient number, since it is larger than the sum of its proper divisors (1).

194403457 is an equidigital number, since it uses as much as digits as its factorization.

194403457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 194403457 is about 13942.8640171236. The cubic root of 194403457 is about 579.2970645875.

It can be divided in two parts, 194 and 403457, that added together give a triangular number (403651 = T₈₉₈).

The spelling of 194403457 in words is "one hundred ninety-four million, four hundred three thousand, four hundred fifty-seven".