19428705 has 48 divisors (see below), whose sum is σ = 36138960. Its totient is φ = 9621504.

The previous prime is 19428691. The next prime is 19428743. The reversal of 19428705 is 50782491.

It can be written as a sum of positive squares in 8 ways, for example, as 7056 + 19421649 = 84^2 + 4407^2 .

It is not a de Polignac number, because 19428705 - 2⁸ = 19428449 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19428705.

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 47 ways as a sum of consecutive naturals, for example, 83269 + ... + 83501.

It is an arithmetic number, because the mean of its divisors is an integer number (752895).

Almost surely, 2^19428705 is an apocalyptic number.

19428705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19428705 is a deficient number, since it is larger than the sum of its proper divisors (16710255).

19428705 is a wasteful number, since it uses less digits than its factorization.

19428705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 19428705 is about 4407.8004718907. The cubic root of 19428705 is about 268.8321991216.

The spelling of 19428705 in words is "nineteen million, four hundred twenty-eight thousand, seven hundred five".