191638146 has 16 divisors (see below), whose sum is σ = 438030144. Its totient is φ = 54753744.

The previous prime is 191638103. The next prime is 191638163. The reversal of 191638146 is 641836191.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2281365 + ... + 2281448.

It is an arithmetic number, because the mean of its divisors is an integer number (27376884).

Almost surely, 2^191638146 is an apocalyptic number.

191638146 is an abundant number, since it is smaller than the sum of its proper divisors (246391998).

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

191638146 is a wasteful number, since it uses less digits than its factorization.

191638146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4562825.

The product of its digits is 31104, while the sum is 39.

The square root of 191638146 is about 13843.3430211058. The cubic root of 191638146 is about 576.5371809168.

The spelling of 191638146 in words is "one hundred ninety-one million, six hundred thirty-eight thousand, one hundred forty-six".