19894974984 has 48 divisors (see below), whose sum is σ = 53974131120. Its totient is φ = 6620346720.

The previous prime is 19894974977. The next prime is 19894974989. The reversal of 19894974984 is 48947949891.

19894974984 is a `hidden beast` number, since 1 + 98 + 9 + 49 + 7 + 498 + 4 = 666.

It is a super-2 number, since 2×19894974984² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (19894974989) 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, 193102 + ... + 277629.

It is an arithmetic number, because the mean of its divisors is an integer number (1124461065).

Almost surely, 2^19894974984 is an apocalyptic number.

It is an amenable number.

19894974984 is an abundant number, since it is smaller than the sum of its proper divisors (34079156136).

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

19894974984 is a wasteful number, since it uses less digits than its factorization.

19894974984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471330 (or 471323 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 72.

The spelling of 19894974984 in words is "nineteen billion, eight hundred ninety-four million, nine hundred seventy-four thousand, nine hundred eighty-four".