19984040 has 16 divisors (see below), whose sum is σ = 44964180. Its totient is φ = 7993600.

The previous prime is 19984039. The next prime is 19984051. The reversal of 19984040 is 4048991.

It can be written as a sum of positive squares in 2 ways, for example, as 19838116 + 145924 = 4454^2 + 382^2 .

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, 249761 + ... + 249840.

Almost surely, 2^19984040 is an apocalyptic number.

19984040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19984040 is an abundant number, since it is smaller than the sum of its proper divisors (24980140).

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

19984040 is a wasteful number, since it uses less digits than its factorization.

19984040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499612 (or 499608 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 19984040 is about 4470.3512166272. The cubic root of 19984040 is about 271.3695389362.

The spelling of 19984040 in words is "nineteen million, nine hundred eighty-four thousand, forty".