19479940 has 24 divisors (see below), whose sum is σ = 43061760. Its totient is φ = 7381728.

The previous prime is 19479937. The next prime is 19479947. The reversal of 19479940 is 4997491.

It is not an unprimeable number, because it can be changed into a prime (19479947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25252 + ... + 26011.

It is an arithmetic number, because the mean of its divisors is an integer number (1794240).

Almost surely, 2^19479940 is an apocalyptic number.

19479940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19479940 is an abundant number, since it is smaller than the sum of its proper divisors (23581820).

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

19479940 is a wasteful number, since it uses less digits than its factorization.

19479940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51291 (or 51289 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 19479940 is about 4413.6085009887. The cubic root of 19479940 is about 269.0683021465.

The spelling of 19479940 in words is "nineteen million, four hundred seventy-nine thousand, nine hundred forty".