19090985 has 8 divisors (see below), whose sum is σ = 22944840. Its totient is φ = 15249024.

The previous prime is 19090979. The next prime is 19090997. The reversal of 19090985 is 58909091.

It can be written as a sum of positive squares in 4 ways, for example, as 12880921 + 6210064 = 3589^2 + 2492^2 .

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 19090985 - 2⁴ = 19090969 is a prime.

It is a Curzon 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, 1061 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (2868105).

Almost surely, 2^19090985 is an apocalyptic number.

It is an amenable number.

19090985 is a deficient number, since it is larger than the sum of its proper divisors (3853855).

19090985 is an equidigital number, since it uses as much as digits as its factorization.

19090985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5947.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 19090985 is about 4369.3231741312. The cubic root of 19090985 is about 267.2654245428.

The spelling of 19090985 in words is "nineteen million, ninety thousand, nine hundred eighty-five".