19209040 has 20 divisors (see below), whose sum is σ = 44661204. Its totient is φ = 7683584.

The previous prime is 19209037. The next prime is 19209053. The reversal of 19209040 is 4090291.

It can be written as a sum of positive squares in 2 ways, for example, as 10705984 + 8503056 = 3272^2 + 2916^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 19208996 and 19209014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119977 + ... + 120136.

Almost surely, 2^19209040 is an apocalyptic number.

19209040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19209040 is an abundant number, since it is smaller than the sum of its proper divisors (25452164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19209040 is a wasteful number, since it uses less digits than its factorization.

19209040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240126 (or 240120 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 19209040 is about 4382.8118827985. The cubic root of 19209040 is about 267.8151989519.

The spelling of 19209040 in words is "nineteen million, two hundred nine thousand, forty".