194939919 has 8 divisors (see below), whose sum is σ = 288799920. Its totient is φ = 129959928.

The previous prime is 194939911. The next prime is 194939923. The reversal of 194939919 is 919939491.

It is not a de Polignac number, because 194939919 - 2³ = 194939911 is a prime.

It is a super-2 number, since 2×194939919² = 76003144039453122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194939911) 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, 3609972 + ... + 3610025.

It is an arithmetic number, because the mean of its divisors is an integer number (36099990).

Almost surely, 2^194939919 is an apocalyptic number.

194939919 is a deficient number, since it is larger than the sum of its proper divisors (93860001).

194939919 is an equidigital number, since it uses as much as digits as its factorization.

194939919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7220006 (or 7220000 counting only the distinct ones).

The product of its digits is 708588, while the sum is 54.

The square root of 194939919 is about 13962.0886331523. The cubic root of 194939919 is about 579.8294375601.

The spelling of 194939919 in words is "one hundred ninety-four million, nine hundred thirty-nine thousand, nine hundred nineteen".