19986090 has 16 divisors (see below), whose sum is σ = 47966688. Its totient is φ = 5329616.

The previous prime is 19986079. The next prime is 19986091. The reversal of 19986090 is 9068991.

It is not an unprimeable number, because it can be changed into a prime (19986091) 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, 333072 + ... + 333131.

It is an arithmetic number, because the mean of its divisors is an integer number (2997918).

Almost surely, 2^19986090 is an apocalyptic number.

19986090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19986090 is an abundant number, since it is smaller than the sum of its proper divisors (27980598).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19986090 is a wasteful number, since it uses less digits than its factorization.

19986090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666213.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 19986090 is about 4470.5804992193. The cubic root of 19986090 is about 271.3788178163.

The spelling of 19986090 in words is "nineteen million, nine hundred eighty-six thousand, ninety".