19814428 has 6 divisors (see below), whose sum is σ = 34675256. Its totient is φ = 9907212.

The previous prime is 19814387. The next prime is 19814429. The reversal of 19814428 is 82441891.

It is a super-3 number, since 3×19814428³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19814429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2476800 + ... + 2476807.

Almost surely, 2^19814428 is an apocalyptic number.

It is an amenable number.

19814428 is a deficient number, since it is larger than the sum of its proper divisors (14860828).

19814428 is a wasteful number, since it uses less digits than its factorization.

19814428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4953611 (or 4953609 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 19814428 is about 4451.3400229594. The cubic root of 19814428 is about 270.5996184507.

The spelling of 19814428 in words is "nineteen million, eight hundred fourteen thousand, four hundred twenty-eight".