19981734 has 8 divisors (see below), whose sum is σ = 39963480. Its totient is φ = 6660576.

The previous prime is 19981727. The next prime is 19981757. The reversal of 19981734 is 43718991.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

19981734 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665139 + ... + 1665150.

It is an arithmetic number, because the mean of its divisors is an integer number (4995435).

Almost surely, 2^19981734 is an apocalyptic number.

19981734 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19981734 is a wasteful number, since it uses less digits than its factorization.

19981734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3330294.

The product of its digits is 54432, while the sum is 42.

The square root of 19981734 is about 4470.0932876172. The cubic root of 19981734 is about 271.3591005693.

The spelling of 19981734 in words is "nineteen million, nine hundred eighty-one thousand, seven hundred thirty-four".