19494009 has 24 divisors (see below), whose sum is σ = 29382912. Its totient is φ = 12440160.

The previous prime is 19494001. The next prime is 19494011. The reversal of 19494009 is 90049491.

It is not a de Polignac number, because 19494009 - 2³ = 19494001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19494001) 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 23 ways as a sum of consecutive naturals, for example, 29527 + ... + 30179.

It is an arithmetic number, because the mean of its divisors is an integer number (1224288).

Almost surely, 2^19494009 is an apocalyptic number.

It is an amenable number.

19494009 is a deficient number, since it is larger than the sum of its proper divisors (9888903).

19494009 is a wasteful number, since it uses less digits than its factorization.

19494009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797 (or 794 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19494009 is about 4415.2020338825. The cubic root of 19494009 is about 269.1330629718.

The spelling of 19494009 in words is "nineteen million, four hundred ninety-four thousand, nine".