19999040 has 28 divisors (see below), whose sum is σ = 47623476. Its totient is φ = 7999488.

The previous prime is 19999027. The next prime is 19999069. The reversal of 19999040 is 4099991.

It can be written as a sum of positive squares in 2 ways, for example, as 7268416 + 12730624 = 2696^2 + 3568^2 .

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, 30929 + ... + 31568.

Almost surely, 2^19999040 is an apocalyptic number.

19999040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19999040 is an abundant number, since it is smaller than the sum of its proper divisors (27624436).

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

19999040 is an equidigital number, since it uses as much as digits as its factorization.

19999040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62514 (or 62504 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 19999040 is about 4472.0286224487. The cubic root of 19999040 is about 271.4374185218.

The spelling of 19999040 in words is "nineteen million, nine hundred ninety-nine thousand, forty".