19855229 has 4 divisors (see below), whose sum is σ = 19899900. Its totient is φ = 19810560.

The previous prime is 19855219. The next prime is 19855243. The reversal of 19855229 is 92255891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16999129 + 2856100 = 4123^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 19855229 - 2¹² = 19851133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19855219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21662 + ... + 22559.

It is an arithmetic number, because the mean of its divisors is an integer number (4974975).

Almost surely, 2^19855229 is an apocalyptic number.

It is an amenable number.

19855229 is a deficient number, since it is larger than the sum of its proper divisors (44671).

19855229 is an equidigital number, since it uses as much as digits as its factorization.

19855229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44670.

The product of its digits is 64800, while the sum is 41.

The square root of 19855229 is about 4455.9206680550. The cubic root of 19855229 is about 270.7852267271.

The spelling of 19855229 in words is "nineteen million, eight hundred fifty-five thousand, two hundred twenty-nine".