194138791 has 16 divisors (see below), whose sum is σ = 252569088. Its totient is φ = 144698400.

The previous prime is 194138761. The next prime is 194138797. The reversal of 194138791 is 197831491.

194138791 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 194138791 - 2⁹ = 194138279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194138797) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53040 + ... + 56581.

It is an arithmetic number, because the mean of its divisors is an integer number (15785568).

Almost surely, 2^194138791 is an apocalyptic number.

194138791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

194138791 is a deficient number, since it is larger than the sum of its proper divisors (58430297).

194138791 is a wasteful number, since it uses less digits than its factorization.

194138791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109662.

The product of its digits is 54432, while the sum is 43.

The square root of 194138791 is about 13933.3696929350. The cubic root of 194138791 is about 579.0340550882.

The spelling of 194138791 in words is "one hundred ninety-four million, one hundred thirty-eight thousand, seven hundred ninety-one".