194939905 has 8 divisors (see below), whose sum is σ = 246240000. Its totient is φ = 147743856.

The previous prime is 194939887. The next prime is 194939909. The reversal of 194939905 is 509939491.

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

It is a cyclic number.

It is not a de Polignac number, because 194939905 - 2²³ = 186551297 is a prime.

It is a super-2 number, since 2×194939905² = 76003133122818050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (194939909) 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, 1025905 + ... + 1026094.

It is an arithmetic number, because the mean of its divisors is an integer number (30780000).

Almost surely, 2^194939905 is an apocalyptic number.

It is an amenable number.

194939905 is a deficient number, since it is larger than the sum of its proper divisors (51300095).

194939905 is a wasteful number, since it uses less digits than its factorization.

194939905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052023.

The product of its (nonzero) digits is 393660, while the sum is 49.

The square root of 194939905 is about 13962.0881317946. The cubic root of 194939905 is about 579.8294236796.

The spelling of 194939905 in words is "one hundred ninety-four million, nine hundred thirty-nine thousand, nine hundred five".