19240040 has 16 divisors (see below), whose sum is σ = 43290180. Its totient is φ = 7696000.

The previous prime is 19240033. The next prime is 19240043. The reversal of 19240040 is 4004291.

It can be written as a sum of positive squares in 2 ways, for example, as 19061956 + 178084 = 4366^2 + 422^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 19239994 and 19240021.

It is not an unprimeable number, because it can be changed into a prime (19240043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240461 + ... + 240540.

Almost surely, 2^19240040 is an apocalyptic number.

19240040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19240040 is an abundant number, since it is smaller than the sum of its proper divisors (24050140).

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

19240040 is a wasteful number, since it uses less digits than its factorization.

19240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481012 (or 481008 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 19240040 is about 4386.3469994974. The cubic root of 19240040 is about 267.9591903406.

The spelling of 19240040 in words is "nineteen million, two hundred forty thousand, forty".