19821474 has 12 divisors (see below), whose sum is σ = 42946566. Its totient is φ = 6607152.

The previous prime is 19821449. The next prime is 19821497. The reversal of 19821474 is 47412891.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 81225 = 4443^2 + 285^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 550579 + ... + 550614.

Almost surely, 2^19821474 is an apocalyptic number.

19821474 is an abundant number, since it is smaller than the sum of its proper divisors (23125092).

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

19821474 is a wasteful number, since it uses less digits than its factorization.

19821474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101201 (or 1101198 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 19821474 is about 4452.1313996781. The cubic root of 19821474 is about 270.6316896760.

The spelling of 19821474 in words is "nineteen million, eight hundred twenty-one thousand, four hundred seventy-four".