19970077 has 2 divisors, whose sum is σ = 19970078. Its totient is φ = 19970076.

The previous prime is 19970063. The next prime is 19970081. The reversal of 19970077 is 77007991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15256836 + 4713241 = 3906^2 + 2171^2 .

It is a cyclic number.

It is not a de Polignac number, because 19970077 - 2¹¹ = 19968029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19970057) 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, 9985038 + 9985039.

It is an arithmetic number, because the mean of its divisors is an integer number (9985039).

Almost surely, 2^19970077 is an apocalyptic number.

It is an amenable number.

19970077 is a deficient number, since it is larger than the sum of its proper divisors (1).

19970077 is an equidigital number, since it uses as much as digits as its factorization.

19970077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 19970077 is about 4468.7892096182. The cubic root of 19970077 is about 271.3063215602.

The spelling of 19970077 in words is "nineteen million, nine hundred seventy thousand, seventy-seven".