19763977 has 2 divisors, whose sum is σ = 19763978. Its totient is φ = 19763976.

The previous prime is 19763959. The next prime is 19763987. The reversal of 19763977 is 77936791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11532816 + 8231161 = 3396^2 + 2869^2 .

It is an emirp because it is prime and its reverse (77936791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19763977 is a prime.

It is a super-2 number, since 2×19763977² = 781229573713058, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19763977.

It is not a weakly prime, because it can be changed into another prime (19763917) 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, 9881988 + 9881989.

It is an arithmetic number, because the mean of its divisors is an integer number (9881989).

Almost surely, 2^19763977 is an apocalyptic number.

It is an amenable number.

19763977 is a deficient number, since it is larger than the sum of its proper divisors (1).

19763977 is an equidigital number, since it uses as much as digits as its factorization.

19763977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500094, while the sum is 49.

The square root of 19763977 is about 4445.6694658960. The cubic root of 19763977 is about 270.3697585967.

The spelling of 19763977 in words is "nineteen million, seven hundred sixty-three thousand, nine hundred seventy-seven".