219012540 has 48 divisors (see below), whose sum is σ = 616445088. Its totient is φ = 58097664.

The previous prime is 219012511. The next prime is 219012571. The reversal of 219012540 is 45210912.

It is a self number, because there is not a number n which added to its sum of digits gives 219012540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2124 + ... + 21036.

It is an arithmetic number, because the mean of its divisors is an integer number (12842606).

Almost surely, 2^219012540 is an apocalyptic number.

219012540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

219012540 is an abundant number, since it is smaller than the sum of its proper divisors (397432548).

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

219012540 is a wasteful number, since it uses less digits than its factorization.

219012540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19118 (or 19116 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 219012540 is about 14799.0722682201. The cubic root of 219012540 is about 602.7765206254.

The spelling of 219012540 in words is "two hundred nineteen million, twelve thousand, five hundred forty".