194239969 has 27 divisors (see below), whose sum is σ = 249740883.
Its totient is φ = 150519600.
The previous prime is 194239957. The next prime is 194239979. The reversal of 194239969 is 969932491.
The square root of 194239969 is 13937.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 2140369 + 192099600 = 1463^2 + 13860^2
It is not a de Polignac number, because 194239969 - 25 = 194239937 is a prime.
It is a super-2 number, since 2×1942399692 = 75458331114241922, which contains 22 as substring.
It is not an unprimeable number, because it can be changed into a prime (194239939) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1073059 + ... + 1073239.
Almost surely, 2194239969 is an apocalyptic number.
194239969 is the 13937-th square number.
194239969 is the 6969-th centered octagonal number.
It is an amenable number.
194239969 is a deficient number, since it is larger than the sum of its proper divisors (55500914).
194239969 is an equidigital number, since it uses as much as digits as its factorization.
194239969 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 398 (or 199 counting only the distinct ones).
The product of its digits is 944784, while the sum is 52.
The cubic root of 194239969 is about 579.1346280387.
Multiplying 194239969 by its product of digits (944784), we get a square (183514814871696 = 135467642).
It can be divided in two parts, 19423 and 9969, that added together give a palindrome (29392).
The spelling of 194239969 in words is "one hundred ninety-four million, two hundred thirty-nine thousand, nine hundred sixty-nine".