19994634 has 64 divisors (see below), whose sum is σ = 49714560. Its totient is φ = 5904000.

The previous prime is 19994591. The next prime is 19994647. The reversal of 19994634 is 43649991.

19994634 is a `hidden beast` number, since 1 + 9 + 9 + 9 + 4 + 634 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 19994634.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23944 + ... + 24764.

It is an arithmetic number, because the mean of its divisors is an integer number (776790).

Almost surely, 2^19994634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19994634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24857280).

19994634 is an abundant number, since it is smaller than the sum of its proper divisors (29719926).

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

19994634 is a wasteful number, since it uses less digits than its factorization.

19994634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 878 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 19994634 is about 4471.5359777150. The cubic root of 19994634 is about 271.4174835465.

The spelling of 19994634 in words is "nineteen million, nine hundred ninety-four thousand, six hundred thirty-four".