19442218 has 8 divisors (see below), whose sum is σ = 29376612. Its totient is φ = 9650016.

The previous prime is 19442191. The next prime is 19442231. The reversal of 19442218 is 81224491.

It can be written as a sum of positive squares in 2 ways, for example, as 19158129 + 284089 = 4377^2 + 533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 19442218.

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, 35205 + ... + 35752.

Almost surely, 2^19442218 is an apocalyptic number.

19442218 is a deficient number, since it is larger than the sum of its proper divisors (9934394).

19442218 is a wasteful number, since it uses less digits than its factorization.

19442218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71096.

The product of its digits is 4608, while the sum is 31.

The square root of 19442218 is about 4409.3330561435. Note that the first 3 decimals coincide. The cubic root of 19442218 is about 268.8945104907.

The spelling of 19442218 in words is "nineteen million, four hundred forty-two thousand, two hundred eighteen".