19988377 has 2 divisors, whose sum is σ = 19988378. Its totient is φ = 19988376.

The previous prime is 19988369. The next prime is 19988383. The reversal of 19988377 is 77388991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 8503056 = 3389^2 + 2916^2 .

It is a cyclic number.

It is not a de Polignac number, because 19988377 - 2³ = 19988369 is a prime.

It is not a weakly prime, because it can be changed into another prime (19988347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9994188 + 9994189.

It is an arithmetic number, because the mean of its divisors is an integer number (9994189).

Almost surely, 2^19988377 is an apocalyptic number.

It is an amenable number.

19988377 is a deficient number, since it is larger than the sum of its proper divisors (1).

19988377 is an equidigital number, since it uses as much as digits as its factorization.

19988377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 52.

The square root of 19988377 is about 4470.8362752398. The cubic root of 19988377 is about 271.3891686768.

The spelling of 19988377 in words is "nineteen million, nine hundred eighty-eight thousand, three hundred seventy-seven".