219791940 has 24 divisors (see below), whose sum is σ = 615417600. Its totient is φ = 58611168.

The previous prime is 219791927. The next prime is 219791947. The reversal of 219791940 is 49197912.

It is a junction number, because it is equal to n+sod(n) for n = 219791892 and 219791901.

It is not an unprimeable number, because it can be changed into a prime (219791947) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1831540 + ... + 1831659.

It is an arithmetic number, because the mean of its divisors is an integer number (25642400).

Almost surely, 2^219791940 is an apocalyptic number.

219791940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

219791940 is an abundant number, since it is smaller than the sum of its proper divisors (395625660).

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

219791940 is a wasteful number, since it uses less digits than its factorization.

219791940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663211 (or 3663209 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 219791940 is about 14825.3816139754. The cubic root of 219791940 is about 603.4907077706.

The spelling of 219791940 in words is "two hundred nineteen million, seven hundred ninety-one thousand, nine hundred forty".