19679240 has 64 divisors (see below), whose sum is σ = 51408000. Its totient is φ = 6640128.

The previous prime is 19679239. The next prime is 19679243. The reversal of 19679240 is 4297691.

It is a junction number, because it is equal to n+sod(n) for n = 19679194 and 19679203.

It is not an unprimeable number, because it can be changed into a prime (19679243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18236 + ... + 19284.

It is an arithmetic number, because the mean of its divisors is an integer number (803250).

Almost surely, 2^19679240 is an apocalyptic number.

19679240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19679240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25704000).

19679240 is an abundant number, since it is smaller than the sum of its proper divisors (31728760).

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

19679240 is a wasteful number, since it uses less digits than its factorization.

19679240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 19679240 is about 4436.1289431215. The cubic root of 19679240 is about 269.9828064040.

The spelling of 19679240 in words is "nineteen million, six hundred seventy-nine thousand, two hundred forty".