19808474 has 32 divisors (see below), whose sum is σ = 35721216. Its totient is φ = 8054640.

The previous prime is 19808449. The next prime is 19808491. The reversal of 19808474 is 47480891.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72959 + ... + 73229.

It is an arithmetic number, because the mean of its divisors is an integer number (1116288).

Almost surely, 2^19808474 is an apocalyptic number.

19808474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19808474 is a deficient number, since it is larger than the sum of its proper divisors (15912742).

19808474 is a wasteful number, since it uses less digits than its factorization.

19808474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 19808474 is about 4450.6711853382. The cubic root of 19808474 is about 270.5725117462.

The spelling of 19808474 in words is "nineteen million, eight hundred eight thousand, four hundred seventy-four".