191438934 has 16 divisors (see below), whose sum is σ = 383522160. Its totient is φ = 63705600.

The previous prime is 191438917. The next prime is 191438939. The reversal of 191438934 is 439834191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191438939) 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, 22939 + ... + 30150.

It is an arithmetic number, because the mean of its divisors is an integer number (23970135).

Almost surely, 2^191438934 is an apocalyptic number.

191438934 is an abundant number, since it is smaller than the sum of its proper divisors (192083226).

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

191438934 is a wasteful number, since it uses less digits than its factorization.

191438934 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53695.

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

The square root of 191438934 is about 13836.1459229079. The cubic root of 191438934 is about 576.3373373614.

The spelling of 191438934 in words is "one hundred ninety-one million, four hundred thirty-eight thousand, nine hundred thirty-four".