19909099 has 16 divisors (see below), whose sum is σ = 24514560. Its totient is φ = 15792480.

The previous prime is 19909081. The next prime is 19909103. The reversal of 19909099 is 99090991.

It is a cyclic number.

It is not a de Polignac number, because 19909099 - 2¹⁵ = 19876331 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19409099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2997 + ... + 6985.

It is an arithmetic number, because the mean of its divisors is an integer number (1532160).

Almost surely, 2^19909099 is an apocalyptic number.

19909099 is a deficient number, since it is larger than the sum of its proper divisors (4605461).

19909099 is a wasteful number, since it uses less digits than its factorization.

19909099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050.

The product of its (nonzero) digits is 59049, while the sum is 46.

The square root of 19909099 is about 4461.9613400387. The cubic root of 19909099 is about 271.0298982550.

The spelling of 19909099 in words is "nineteen million, nine hundred nine thousand, ninety-nine".