19090994 has 16 divisors (see below), whose sum is σ = 31593240. Its totient is φ = 8595840.

The previous prime is 19090979. The next prime is 19090997. The reversal of 19090994 is 49909091.

It can be written as a sum of positive squares in 4 ways, for example, as 7360369 + 11730625 = 2713^2 + 3425^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (19090997) 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, 7889 + ... + 10020.

Almost surely, 2^19090994 is an apocalyptic number.

19090994 is a deficient number, since it is larger than the sum of its proper divisors (12502246).

19090994 is a wasteful number, since it uses less digits than its factorization.

19090994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17965.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 19090994 is about 4369.3242040389. The cubic root of 19090994 is about 267.2654665415.

The spelling of 19090994 in words is "nineteen million, ninety thousand, nine hundred ninety-four".