19907428 has 24 divisors (see below), whose sum is σ = 35497280. Its totient is φ = 9767520.

The previous prime is 19907423. The next prime is 19907429. The reversal of 19907428 is 82470991.

It is not an unprimeable number, because it can be changed into a prime (19907423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86818 + ... + 87046.

Almost surely, 2^19907428 is an apocalyptic number.

It is an amenable number.

19907428 is a deficient number, since it is larger than the sum of its proper divisors (15589852).

19907428 is a wasteful number, since it uses less digits than its factorization.

19907428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 19907428 is about 4461.7740866162. The cubic root of 19907428 is about 271.0223153966.

The spelling of 19907428 in words is "nineteen million, nine hundred seven thousand, four hundred twenty-eight".