19404428 has 12 divisors (see below), whose sum is σ = 34875792. Its totient is φ = 9439920.

The previous prime is 19404409. The next prime is 19404443. The reversal of 19404428 is 82440491.

It is a junction number, because it is equal to n+sod(n) for n = 19404394 and 19404403.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65408 + ... + 65703.

It is an arithmetic number, because the mean of its divisors is an integer number (2906316).

Almost surely, 2^19404428 is an apocalyptic number.

It is an amenable number.

19404428 is a deficient number, since it is larger than the sum of its proper divisors (15471364).

19404428 is a wasteful number, since it uses less digits than its factorization.

19404428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131152 (or 131150 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 19404428 is about 4405.0457432358. The cubic root of 19404428 is about 268.7201799976.

The spelling of 19404428 in words is "nineteen million, four hundred four thousand, four hundred twenty-eight".