219855640 has 32 divisors (see below), whose sum is σ = 495470880. Its totient is φ = 87800832.

The previous prime is 219855619. The next prime is 219855659. The reversal of 219855640 is 46558912.

219855640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 219855593 and 219855602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22837 + ... + 31003.

It is an arithmetic number, because the mean of its divisors is an integer number (15483465).

Almost surely, 2^219855640 is an apocalyptic number.

219855640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

219855640 is an abundant number, since it is smaller than the sum of its proper divisors (275615240).

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

219855640 is a wasteful number, since it uses less digits than its factorization.

219855640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8851 (or 8847 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 219855640 is about 14827.5298010154. The cubic root of 219855640 is about 603.5490032733.

The spelling of 219855640 in words is "two hundred nineteen million, eight hundred fifty-five thousand, six hundred forty".