19968877 has 2 divisors, whose sum is σ = 19968878. Its totient is φ = 19968876.

The previous prime is 19968869. The next prime is 19968889. The reversal of 19968877 is 77886991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19616041 + 352836 = 4429^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 19968877 - 2³ = 19968869 is a prime.

It is a super-2 number, since 2×19968877² = 797512097282258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19968827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9984438 + 9984439.

It is an arithmetic number, because the mean of its divisors is an integer number (9984439).

Almost surely, 2^19968877 is an apocalyptic number.

It is an amenable number.

19968877 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968877 is an equidigital number, since it uses as much as digits as its factorization.

19968877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 19968877 is about 4468.6549430449. The cubic root of 19968877 is about 271.3008871945.

The spelling of 19968877 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred seventy-seven".