19742218 has 8 divisors (see below), whose sum is σ = 29699712. Its totient is φ = 9842316.

The previous prime is 19742207. The next prime is 19742221. The reversal of 19742218 is 81224791.

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

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, 13530 + ... + 14917.

It is an arithmetic number, because the mean of its divisors is an integer number (3712464).

Almost surely, 2^19742218 is an apocalyptic number.

19742218 is a deficient number, since it is larger than the sum of its proper divisors (9957494).

19742218 is a wasteful number, since it uses less digits than its factorization.

19742218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28796.

The product of its digits is 8064, while the sum is 34.

The square root of 19742218 is about 4443.2215789897. The cubic root of 19742218 is about 270.2705016533.

The spelling of 19742218 in words is "nineteen million, seven hundred forty-two thousand, two hundred eighteen".