194978135 has 8 divisors (see below), whose sum is σ = 255244176. Its totient is φ = 141802240.

The previous prime is 194978131. The next prime is 194978237. The reversal of 194978135 is 531879491.

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

It is not a de Polignac number, because 194978135 - 2² = 194978131 is a prime.

It is a super-3 number, since 3×194978135³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194978135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194978131) 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, 1772474 + ... + 1772583.

It is an arithmetic number, because the mean of its divisors is an integer number (31905522).

Almost surely, 2^194978135 is an apocalyptic number.

194978135 is a deficient number, since it is larger than the sum of its proper divisors (60266041).

194978135 is a wasteful number, since it uses less digits than its factorization.

194978135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545073.

The product of its digits is 272160, while the sum is 47.

The square root of 194978135 is about 13963.4571292356. The cubic root of 194978135 is about 579.8673249839.

The spelling of 194978135 in words is "one hundred ninety-four million, nine hundred seventy-eight thousand, one hundred thirty-five".