19894472343684 has 81 divisors (see below), whose sum is σ = 50583497639493. Its totient is φ = 6592855472064.

The previous prime is 19894472343679. The next prime is 19894472343689. The reversal of 19894472343684 is 48634327449891.

The square root of 19894472343684 is 4460322.

It is a perfect power (a square), and thus also a powerful number.

19894472343684 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 44 + 72 + 3 + 436 + 84 = 666.

It is an interprime number because it is at equal distance from previous prime (19894472343679) and next prime (19894472343689).

It can be written as a sum of positive squares in only one way, i.e., 238798368900 + 19655673974784 = 488670^2 + 4433472^2 .

It is not an unprimeable number, because it can be changed into a prime (19894472343689) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4790383752 + ... + 4790387904.

Almost surely, 2^{19894472343684} is an apocalyptic number.

19894472343684 is the 4460322-nd square number.

It is an amenable number.

19894472343684 is an abundant number, since it is smaller than the sum of its proper divisors (30689025295809).

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

19894472343684 is an frugal number, since it uses more digits than its factorization.

19894472343684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8674 (or 4337 counting only the distinct ones).

The product of its digits is 1003290624, while the sum is 72.

The spelling of 19894472343684 in words is "nineteen trillion, eight hundred ninety-four billion, four hundred seventy-two million, three hundred forty-three thousand, six hundred eighty-four".