191838924 has 18 divisors (see below), whose sum is σ = 484926260. Its totient is φ = 63946296.

The previous prime is 191838923. The next prime is 191838971. The reversal of 191838924 is 429838191.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×191838924² = 73604345522955552, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 191838924.

It is not an unprimeable number, because it can be changed into a prime (191838923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2664394 + ... + 2664465.

Almost surely, 2^191838924 is an apocalyptic number.

It is an amenable number.

191838924 is an abundant number, since it is smaller than the sum of its proper divisors (293087336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191838924 is a wasteful number, since it uses less digits than its factorization.

191838924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5328869 (or 5328864 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 191838924 is about 13850.5929114966. The cubic root of 191838924 is about 576.7384553541.

The spelling of 191838924 in words is "one hundred ninety-one million, eight hundred thirty-eight thousand, nine hundred twenty-four".