194136989 has 8 divisors (see below), whose sum is σ = 197268000. Its totient is φ = 191012976.

The previous prime is 194136977. The next prime is 194137007. The reversal of 194136989 is 989631491.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194136989 is a prime.

It is a super-2 number, since 2×194136989² = 75378340995972242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194136919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99467 + ... + 101399.

It is an arithmetic number, because the mean of its divisors is an integer number (24658500).

Almost surely, 2^194136989 is an apocalyptic number.

It is an amenable number.

194136989 is a deficient number, since it is larger than the sum of its proper divisors (3131011).

194136989 is a wasteful number, since it uses less digits than its factorization.

194136989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3499.

The product of its digits is 419904, while the sum is 50.

The square root of 194136989 is about 13933.3050278819. The cubic root of 194136989 is about 579.0322635476.

The spelling of 194136989 in words is "one hundred ninety-four million, one hundred thirty-six thousand, nine hundred eighty-nine".