19045809 has 24 divisors (see below), whose sum is σ = 29219840. Its totient is φ = 11920608.

The previous prime is 19045801. The next prime is 19045841. The reversal of 19045809 is 90854091.

It is not a de Polignac number, because 19045809 - 2³ = 19045801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19045801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21279 + ... + 22155.

Almost surely, 2^19045809 is an apocalyptic number.

19045809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19045809 is a deficient number, since it is larger than the sum of its proper divisors (10174031).

19045809 is a wasteful number, since it uses less digits than its factorization.

19045809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1026 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 19045809 is about 4364.1504327876. The cubic root of 19045809 is about 267.0544433018.

The spelling of 19045809 in words is "nineteen million, forty-five thousand, eight hundred nine".