19616940 has 72 divisors (see below), whose sum is σ = 68009760. Its totient is φ = 4483584.

The previous prime is 19616939. The next prime is 19616957. The reversal of 19616940 is 4961691.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 19616895 and 19616904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6525 + ... + 9044.

It is an arithmetic number, because the mean of its divisors is an integer number (944580).

Almost surely, 2^19616940 is an apocalyptic number.

19616940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19616940 is an abundant number, since it is smaller than the sum of its proper divisors (48392820).

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

19616940 is a wasteful number, since it uses less digits than its factorization.

19616940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15591 (or 15586 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 19616940 is about 4429.1014890156. The cubic root of 19616940 is about 269.6976038339.

The spelling of 19616940 in words is "nineteen million, six hundred sixteen thousand, nine hundred forty".