193945 has 8 divisors (see below), whose sum is σ = 236160. Its totient is φ = 152880.

The previous prime is 193943. The next prime is 193951. The reversal of 193945 is 549391.

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

It is not a de Polignac number, because 193945 - 2¹ = 193943 is a prime.

It is a super-2 number, since 2×193945² = 75229326050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150 + ... + 640.

It is an arithmetic number, because the mean of its divisors is an integer number (29520).

193945 is a Friedman number, since it can be written as 491*395, using all its digits and the basic arithmetic operations.

It is a vampire number, since it can be written as 395 ⋅ 491 (with its own digits).

2¹⁹³⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

193945 is a deficient number, since it is larger than the sum of its proper divisors (42215).

193945 is an equidigital number, since it uses as much as digits as its factorization.

193945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 575.

The product of its digits is 4860, while the sum is 31.

The square root of 193945 is about 440.3918709513. The cubic root of 193945 is about 57.8841325365.

The spelling of 193945 in words is "one hundred ninety-three thousand, nine hundred forty-five".