194640473 has 2 divisors, whose sum is σ = 194640474. Its totient is φ = 194640472.

The previous prime is 194640443. The next prime is 194640487. The reversal of 194640473 is 374046491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142396489 + 52243984 = 11933^2 + 7228^2 .

It is a cyclic number.

It is not a de Polignac number, because 194640473 - 2⁶ = 194640409 is a prime.

It is not a weakly prime, because it can be changed into another prime (194640443) 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, 97320236 + 97320237.

It is an arithmetic number, because the mean of its divisors is an integer number (97320237).

Almost surely, 2^194640473 is an apocalyptic number.

It is an amenable number.

194640473 is a deficient number, since it is larger than the sum of its proper divisors (1).

194640473 is an equidigital number, since it uses as much as digits as its factorization.

194640473 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 194640473 is about 13951.3609730377. The cubic root of 194640473 is about 579.5323946125.

The spelling of 194640473 in words is "one hundred ninety-four million, six hundred forty thousand, four hundred seventy-three".