194540985 has 24 divisors (see below), whose sum is σ = 341829384. Its totient is φ = 102332160.

The previous prime is 194540977. The next prime is 194541031. The reversal of 194540985 is 589045491.

194540985 is a `hidden beast` number, since 19 + 4 + 540 + 98 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12938409 + 181602576 = 3597^2 + 13476^2 .

It is not a de Polignac number, because 194540985 - 2³ = 194540977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 194540985.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26326 + ... + 32895.

It is an arithmetic number, because the mean of its divisors is an integer number (14242891).

Almost surely, 2^194540985 is an apocalyptic number.

194540985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

194540985 is a deficient number, since it is larger than the sum of its proper divisors (147288399).

194540985 is a wasteful number, since it uses less digits than its factorization.

194540985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59305 (or 59302 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 194540985 is about 13947.7949870221. The cubic root of 194540985 is about 579.4336375824.

The spelling of 194540985 in words is "one hundred ninety-four million, five hundred forty thousand, nine hundred eighty-five".