19872394 has 4 divisors (see below), whose sum is σ = 29808594. Its totient is φ = 9936196.

The previous prime is 19872389. The next prime is 19872421. The reversal of 19872394 is 49327891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10478169 + 9394225 = 3237^2 + 3065^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19872394.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4968097 + ... + 4968100.

Almost surely, 2^19872394 is an apocalyptic number.

19872394 is a deficient number, since it is larger than the sum of its proper divisors (9936200).

19872394 is an equidigital number, since it uses as much as digits as its factorization.

19872394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9936199.

The product of its digits is 108864, while the sum is 43.

The square root of 19872394 is about 4457.8463410037. The cubic root of 19872394 is about 270.8632362302.

The spelling of 19872394 in words is "nineteen million, eight hundred seventy-two thousand, three hundred ninety-four".