19428487 has 8 divisors (see below), whose sum is σ = 21116480. Its totient is φ = 17768160.

The previous prime is 19428473. The next prime is 19428509. The reversal of 19428487 is 78482491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19428487 - 2¹¹ = 19426439 is a prime.

It is a super-2 number, since 2×19428487² = 754932214218338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19428407) 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, 5439 + ... + 8272.

It is an arithmetic number, because the mean of its divisors is an integer number (2639560).

Almost surely, 2^19428487 is an apocalyptic number.

19428487 is a deficient number, since it is larger than the sum of its proper divisors (1687993).

19428487 is a wasteful number, since it uses less digits than its factorization.

19428487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13833.

The product of its digits is 129024, while the sum is 43.

The square root of 19428487 is about 4407.7757429343. The cubic root of 19428487 is about 268.8311936396.

The spelling of 19428487 in words is "nineteen million, four hundred twenty-eight thousand, four hundred eighty-seven".