19818428 has 12 divisors (see below), whose sum is σ = 39636912. Its totient is φ = 8493600.

The previous prime is 19818427. The next prime is 19818437. The reversal of 19818428 is 82481891.

19818428 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19818427) 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, 353873 + ... + 353928.

It is an arithmetic number, because the mean of its divisors is an integer number (3303076).

Almost surely, 2^19818428 is an apocalyptic number.

It is an amenable number.

19818428 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19818428 is a wasteful number, since it uses less digits than its factorization.

19818428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707812 (or 707810 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 19818428 is about 4451.7893031903. The cubic root of 19818428 is about 270.6178261534.

The spelling of 19818428 in words is "nineteen million, eight hundred eighteen thousand, four hundred twenty-eight".