19651996 has 36 divisors (see below), whose sum is σ = 42570192. Its totient is φ = 7772544.

The previous prime is 19651987. The next prime is 19651999. The reversal of 19651996 is 69915691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19651999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2656 + ... + 6808.

Almost surely, 2^19651996 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19651996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21285096).

19651996 is an abundant number, since it is smaller than the sum of its proper divisors (22918196).

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

19651996 is a wasteful number, since it uses less digits than its factorization.

19651996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4190 (or 4175 counting only the distinct ones).

The product of its digits is 131220, while the sum is 46.

The square root of 19651996 is about 4433.0571843819. The cubic root of 19651996 is about 269.8581605255.

The spelling of 19651996 in words is "nineteen million, six hundred fifty-one thousand, nine hundred ninety-six".