19509428 has 24 divisors (see below), whose sum is σ = 37504320. Its totient is φ = 8838720.

The previous prime is 19509419. The next prime is 19509433. The reversal of 19509428 is 82490591.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 19509391 and 19509400.

It is a congruent number.

It is an unprimeable number.

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, 3833 + ... + 7328.

It is an arithmetic number, because the mean of its divisors is an integer number (1562680).

Almost surely, 2^19509428 is an apocalyptic number.

It is an amenable number.

19509428 is a deficient number, since it is larger than the sum of its proper divisors (17994892).

19509428 is a wasteful number, since it uses less digits than its factorization.

19509428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11207 (or 11205 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 19509428 is about 4416.9478149510. The cubic root of 19509428 is about 269.2040021866.

The spelling of 19509428 in words is "nineteen million, five hundred nine thousand, four hundred twenty-eight".