291906 has 12 divisors (see below), whose sum is σ = 632502. Its totient is φ = 97296.

The previous prime is 291901. The next prime is 291923. The reversal of 291906 is 609192.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 210681 + 81225 = 459^2 + 285^2 .

It is a super-2 number, since 2×291906² = 170418225672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 291906.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291906.

It is not an unprimeable number, because it can be changed into a prime (291901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8091 + ... + 8126.

2²⁹¹⁹⁰⁶ is an apocalyptic number.

291906 is an abundant number, since it is smaller than the sum of its proper divisors (340596).

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

291906 is a wasteful number, since it uses less digits than its factorization.

291906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16225 (or 16222 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 291906 is about 540.2832590410. The cubic root of 291906 is about 66.3357546204.

The spelling of 291906 in words is "two hundred ninety-one thousand, nine hundred six".