19869228 has 36 divisors (see below), whose sum is σ = 50366680. Its totient is φ = 6604416.

The previous prime is 19869221. The next prime is 19869257. The reversal of 19869228 is 82296891.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (19869221) 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 in 11 ways as a sum of consecutive naturals, for example, 19188 + ... + 20196.

Almost surely, 2^19869228 is an apocalyptic number.

19869228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19869228 is an abundant number, since it is smaller than the sum of its proper divisors (30497452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19869228 is a wasteful number, since it uses less digits than its factorization.

19869228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566 (or 1561 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 19869228 is about 4457.4912226498. The cubic root of 19869228 is about 270.8488511398.

The spelling of 19869228 in words is "nineteen million, eight hundred sixty-nine thousand, two hundred twenty-eight".