19858049 has 2 divisors, whose sum is σ = 19858050. Its totient is φ = 19858048.

The previous prime is 19858037. The next prime is 19858051. The reversal of 19858049 is 94085891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14250625 + 5607424 = 3775^2 + 2368^2 .

It is a cyclic number.

It is not a de Polignac number, because 19858049 - 2²⁰ = 18809473 is a prime.

It is a super-2 number, since 2×19858049² = 788684220172802, which contains 22 as substring.

Together with 19858051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19858019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9929024 + 9929025.

It is an arithmetic number, because the mean of its divisors is an integer number (9929025).

Almost surely, 2^19858049 is an apocalyptic number.

It is an amenable number.

19858049 is a deficient number, since it is larger than the sum of its proper divisors (1).

19858049 is an equidigital number, since it uses as much as digits as its factorization.

19858049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 19858049 is about 4456.2370897429. The cubic root of 19858049 is about 270.7980458220.

The spelling of 19858049 in words is "nineteen million, eight hundred fifty-eight thousand, forty-nine".