194408642 has 8 divisors (see below), whose sum is σ = 291676476. Its totient is φ = 97183152.

The previous prime is 194408639. The next prime is 194408653. The reversal of 194408642 is 246804491.

It can be written as a sum of positive squares in 2 ways, for example, as 170798761 + 23609881 = 13069^2 + 4859^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 194408596 and 194408605.

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 in 3 ways as a sum of consecutive naturals, for example, 6248 + ... + 20684.

Almost surely, 2^194408642 is an apocalyptic number.

194408642 is a deficient number, since it is larger than the sum of its proper divisors (97267834).

194408642 is a wasteful number, since it uses less digits than its factorization.

194408642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21172.

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 194408642 is about 13943.0499532921. The cubic root of 194408642 is about 579.3022147506.

It can be divided in two parts, 19440 and 8642, that added together give a palindrome (28082).

The spelling of 194408642 in words is "one hundred ninety-four million, four hundred eight thousand, six hundred forty-two".