19993277 has 2 divisors, whose sum is σ = 19993278. Its totient is φ = 19993276.

The previous prime is 19993273. The next prime is 19993291. The reversal of 19993277 is 77239991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19971961 + 21316 = 4469^2 + 146^2 .

It is an emirp because it is prime and its reverse (77239991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19993277 - 2² = 19993273 is a prime.

It is a super-2 number, since 2×19993277² = 799462250397458, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19993273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9996638 + 9996639.

It is an arithmetic number, because the mean of its divisors is an integer number (9996639).

Almost surely, 2^19993277 is an apocalyptic number.

It is an amenable number.

19993277 is a deficient number, since it is larger than the sum of its proper divisors (1).

19993277 is an equidigital number, since it uses as much as digits as its factorization.

19993277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 214326, while the sum is 47.

The square root of 19993277 is about 4471.3842375712. The cubic root of 19993277 is about 271.4113432015.

The spelling of 19993277 in words is "nineteen million, nine hundred ninety-three thousand, two hundred seventy-seven".