191438439 has 8 divisors (see below), whose sum is σ = 255321840. Its totient is φ = 127590336.

The previous prime is 191438419. The next prime is 191438449. The reversal of 191438439 is 934834191.

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

It is not a de Polignac number, because 191438439 - 2¹⁷ = 191307367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 191438439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191438419) 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, 8947 + ... + 21515.

It is an arithmetic number, because the mean of its divisors is an integer number (31915230).

Almost surely, 2^191438439 is an apocalyptic number.

191438439 is a deficient number, since it is larger than the sum of its proper divisors (63883401).

191438439 is a wasteful number, since it uses less digits than its factorization.

191438439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17649.

The product of its digits is 93312, while the sum is 42.

The square root of 191438439 is about 13836.1280349670. The cubic root of 191438439 is about 576.3368406195.

The spelling of 191438439 in words is "one hundred ninety-one million, four hundred thirty-eight thousand, four hundred thirty-nine".