19972318 has 8 divisors (see below), whose sum is σ = 30249648. Its totient is φ = 9889104.

The previous prime is 19972291. The next prime is 19972319. The reversal of 19972318 is 81327991.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19972319) 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 3 ways as a sum of consecutive naturals, for example, 48271 + ... + 48682.

It is an arithmetic number, because the mean of its divisors is an integer number (3781206).

Almost surely, 2^19972318 is an apocalyptic number.

19972318 is a deficient number, since it is larger than the sum of its proper divisors (10277330).

19972318 is a wasteful number, since it uses less digits than its factorization.

19972318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97058.

The product of its digits is 27216, while the sum is 40.

The square root of 19972318 is about 4469.0399416429. The cubic root of 19972318 is about 271.3164696554.

The spelling of 19972318 in words is "nineteen million, nine hundred seventy-two thousand, three hundred eighteen".