194394919 has 4 divisors (see below), whose sum is σ = 202846896. Its totient is φ = 185942944.

The previous prime is 194394883. The next prime is 194394953. The reversal of 194394919 is 919493491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919493491 = 7 ⋅131356213.

It is a cyclic number.

It is not a de Polignac number, because 194394919 - 2⁷ = 194394791 is a prime.

It is a super-2 number, since 2×194394919² = 75578769066033122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194394979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4225954 + ... + 4225999.

It is an arithmetic number, because the mean of its divisors is an integer number (50711724).

Almost surely, 2^194394919 is an apocalyptic number.

194394919 is a deficient number, since it is larger than the sum of its proper divisors (8451977).

194394919 is an equidigital number, since it uses as much as digits as its factorization.

194394919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8451976.

The product of its digits is 314928, while the sum is 49.

The square root of 194394919 is about 13942.5578356340. The cubic root of 194394919 is about 579.2885837528.

The spelling of 194394919 in words is "one hundred ninety-four million, three hundred ninety-four thousand, nine hundred nineteen".