19690057 has 2 divisors, whose sum is σ = 19690058. Its totient is φ = 19690056.

The previous prime is 19690049. The next prime is 19690079. The reversal of 19690057 is 75009691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10055241 + 9634816 = 3171^2 + 3104^2 .

It is a cyclic number.

It is not a de Polignac number, because 19690057 - 2³ = 19690049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19689998 and 19690025.

It is not a weakly prime, because it can be changed into another prime (19690037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9845028 + 9845029.

It is an arithmetic number, because the mean of its divisors is an integer number (9845029).

Almost surely, 2^19690057 is an apocalyptic number.

It is an amenable number.

19690057 is a deficient number, since it is larger than the sum of its proper divisors (1).

19690057 is an equidigital number, since it uses as much as digits as its factorization.

19690057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 19690057 is about 4437.3479692267. The cubic root of 19690057 is about 270.0322640914.

The spelling of 19690057 in words is "nineteen million, six hundred ninety thousand, fifty-seven".