19838240 has 24 divisors (see below), whose sum is σ = 46868220. Its totient is φ = 7935232.

The previous prime is 19838209. The next prime is 19838257. The reversal of 19838240 is 4283891.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19254544 + 583696 = 4388^2 + 764^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19838240.

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 3 ways as a sum of consecutive naturals, for example, 61835 + ... + 62154.

Almost surely, 2^19838240 is an apocalyptic number.

19838240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19838240 is an abundant number, since it is smaller than the sum of its proper divisors (27029980).

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

19838240 is a wasteful number, since it uses less digits than its factorization.

19838240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124004 (or 123996 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 19838240 is about 4454.0139200501. The cubic root of 19838240 is about 270.7079728052.

The spelling of 19838240 in words is "nineteen million, eight hundred thirty-eight thousand, two hundred forty".