19004428 has 24 divisors (see below), whose sum is σ = 34310304.
Its totient is φ = 9206400.
The previous prime is 19004413. The next prime is 19004429. The reversal of 19004428 is 82440091.
It is a super-2 number, since 2×190044282 = 722336567214368, which contains 22 as substring.
It is a fibodiv number, since the Fibonacci-like sequence with seeds 190 and 4428 contains 19004428 itself.
It is a junction number, because it is equal to n+sod(n) for n = 19004396 and 19004405.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (19004429) 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 in 7 ways as a sum of consecutive naturals, for example, 16776 + ... + 17872.
It is an arithmetic number, because the mean of its divisors is an integer number (1429596).
Almost surely, 219004428 is an apocalyptic number.
It is an amenable number.
19004428 is a deficient number, since it is larger than the sum of its proper divisors (15305876).
19004428 is a wasteful number, since it uses less digits than its factorization.
19004428 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1233 (or 1231 counting only the distinct ones).
The product of its (nonzero) digits is 2304, while the sum is 28.
The square root of 19004428 is about 4359.4068403855.
The cubic root of 19004428 is about 266.8608925296.
It can be divided in two parts, 1900 and 4428, that added together give a triangular number (6328 = T112).
The spelling of 19004428 in words is "nineteen million, four thousand, four hundred twenty-eight".