19643912 has 12 divisors (see below), whose sum is σ = 36855855. Its totient is φ = 9815688.

The previous prime is 19643839. The next prime is 19643941. The reversal of 19643912 is 21934691.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 9821956 + 9821956 = 3134^2 + 3134^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3134.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 11753 + ... + 13319.

Almost surely, 2^19643912 is an apocalyptic number.

It is an amenable number.

19643912 is a deficient number, since it is larger than the sum of its proper divisors (17211943).

19643912 is an frugal number, since it uses more digits than its factorization.

19643912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140 (or 1569 counting only the distinct ones).

The product of its digits is 11664, while the sum is 35.

The square root of 19643912 is about 4432.1453044773. The cubic root of 19643912 is about 269.8211527059.

The spelling of 19643912 in words is "nineteen million, six hundred forty-three thousand, nine hundred twelve".