194491887 has 16 divisors (see below), whose sum is σ = 273396480. Its totient is φ = 122740992.

The previous prime is 194491879. The next prime is 194491889. The reversal of 194491887 is 788194491.

It is not a de Polignac number, because 194491887 - 2³ = 194491879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194491889) 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, 7837 + ... + 21222.

It is an arithmetic number, because the mean of its divisors is an integer number (17087280).

Almost surely, 2^194491887 is an apocalyptic number.

194491887 is a deficient number, since it is larger than the sum of its proper divisors (78904593).

194491887 is a wasteful number, since it uses less digits than its factorization.

194491887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29182.

The product of its digits is 580608, while the sum is 51.

The square root of 194491887 is about 13946.0348128061. The cubic root of 194491887 is about 579.3848879125.

The spelling of 194491887 in words is "one hundred ninety-four million, four hundred ninety-one thousand, eight hundred eighty-seven".