194990257 has 12 divisors (see below), whose sum is σ = 247446576. Its totient is φ = 151940040.

The previous prime is 194990239. The next prime is 194990261. The reversal of 194990257 is 752099491.

It is a happy number.

It is not a de Polignac number, because 194990257 - 2²⁷ = 60772529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194990207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180343 + ... + 181420.

It is an arithmetic number, because the mean of its divisors is an integer number (20620548).

Almost surely, 2^194990257 is an apocalyptic number.

It is an amenable number.

194990257 is a deficient number, since it is larger than the sum of its proper divisors (52456319).

194990257 is a wasteful number, since it uses less digits than its factorization.

194990257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361788 (or 361781 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 46.

The square root of 194990257 is about 13963.8911840504. The cubic root of 194990257 is about 579.8793417262.

The spelling of 194990257 in words is "one hundred ninety-four million, nine hundred ninety thousand, two hundred fifty-seven".