19090090 has 16 divisors (see below), whose sum is σ = 34412040. Its totient is φ = 7624960.

The previous prime is 19090087. The next prime is 19090103. The reversal of 19090090 is 9009091.

It can be written as a sum of positive squares in 4 ways, for example, as 17065161 + 2024929 = 4131^2 + 1423^2 .

It is a plaindrome in base 16.

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, 12150 + ... + 13630.

Almost surely, 2^19090090 is an apocalyptic number.

19090090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19090090 is a deficient number, since it is larger than the sum of its proper divisors (15321950).

19090090 is a wasteful number, since it uses less digits than its factorization.

19090090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 19090090 is about 4369.2207543222. The cubic root of 19090090 is about 267.2612479416.

The spelling of 19090090 in words is "nineteen million, ninety thousand, ninety".