219999942 has 16 divisors (see below), whose sum is σ = 488888880. Its totient is φ = 73333296.

The previous prime is 219999919. The next prime is 220000013. The reversal of 219999942 is 249999912.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 4074073 = 219999942 / (2 + 1 + 9 + 9 + 9 + 9 + 9 + 4 + 2).

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, 2036983 + ... + 2037090.

It is an arithmetic number, because the mean of its divisors is an integer number (30555555).

Almost surely, 2^219999942 is an apocalyptic number.

219999942 is an abundant number, since it is smaller than the sum of its proper divisors (268888938).

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

219999942 is a wasteful number, since it uses less digits than its factorization.

219999942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074084 (or 4074078 counting only the distinct ones).

The product of its digits is 944784, while the sum is 54.

The square root of 219999942 is about 14832.3950190116. The cubic root of 219999942 is about 603.6810206290.

The spelling of 219999942 in words is "two hundred nineteen million, nine hundred ninety-nine thousand, nine hundred forty-two".