19942218 has 24 divisors (see below), whose sum is σ = 43453956. Its totient is φ = 6609600.

The previous prime is 19942217. The next prime is 19942249. The reversal of 19942218 is 81224991.

It can be written as a sum of positive squares in 2 ways, for example, as 14311089 + 5631129 = 3783^2 + 2373^2 .

It is not an unprimeable number, because it can be changed into a prime (19942217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198 + ... + 6318.

Almost surely, 2^19942218 is an apocalyptic number.

19942218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19942218 is an abundant number, since it is smaller than the sum of its proper divisors (23511738).

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

19942218 is a wasteful number, since it uses less digits than its factorization.

19942218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6310 (or 6307 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 19942218 is about 4465.6710581949. The cubic root of 19942218 is about 271.1801020460.

The spelling of 19942218 in words is "nineteen million, nine hundred forty-two thousand, two hundred eighteen".