191906 has 24 divisors (see below), whose sum is σ = 346332. Its totient is φ = 79200.

The previous prime is 191903. The next prime is 191911. The reversal of 191906 is 609191.

It can be written as a sum of positive squares in 2 ways, for example, as 148225 + 43681 = 385^2 + 209^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3116 + ... + 3176.

2¹⁹¹⁹⁰⁶ is an apocalyptic number.

191906 is a deficient number, since it is larger than the sum of its proper divisors (154426).

191906 is a wasteful number, since it uses less digits than its factorization.

191906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 191906 is about 438.0707705383. The cubic root of 191906 is about 57.6805665908.

191906 divided by its sum of digits (26) gives a triangular number (7381 = T₁₂₁).

The spelling of 191906 in words is "one hundred ninety-one thousand, nine hundred six".