19716440 has 16 divisors (see below), whose sum is σ = 44362080. Its totient is φ = 7886560.

The previous prime is 19716439. The next prime is 19716479. The reversal of 19716440 is 4461791.

It is a junction number, because it is equal to n+sod(n) for n = 19716397 and 19716406.

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, 246416 + ... + 246495.

It is an arithmetic number, because the mean of its divisors is an integer number (2772630).

Almost surely, 2^19716440 is an apocalyptic number.

19716440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19716440 is an abundant number, since it is smaller than the sum of its proper divisors (24645640).

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

19716440 is a wasteful number, since it uses less digits than its factorization.

19716440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492922 (or 492918 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 19716440 is about 4440.3198083021. The cubic root of 19716440 is about 270.1528170117.

The spelling of 19716440 in words is "nineteen million, seven hundred sixteen thousand, four hundred forty".