19986077 has 2 divisors, whose sum is σ = 19986078. Its totient is φ = 19986076.

The previous prime is 19986061. The next prime is 19986079. The reversal of 19986077 is 77068991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19483396 + 502681 = 4414^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 19986077 - 2⁴ = 19986061 is a prime.

Together with 19986079, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19986079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993038 + 9993039.

It is an arithmetic number, because the mean of its divisors is an integer number (9993039).

Almost surely, 2^19986077 is an apocalyptic number.

It is an amenable number.

19986077 is a deficient number, since it is larger than the sum of its proper divisors (1).

19986077 is an equidigital number, since it uses as much as digits as its factorization.

19986077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 19986077 is about 4470.5790452692. The cubic root of 19986077 is about 271.3787589767.

The spelling of 19986077 in words is "nineteen million, nine hundred eighty-six thousand, seventy-seven".