291864 has 16 divisors (see below), whose sum is σ = 729720. Its totient is φ = 97280.

The previous prime is 291857. The next prime is 291869. The reversal of 291864 is 468192.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 291864.

It is not an unprimeable number, because it can be changed into a prime (291869) by changing a digit.

291864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 6057 + ... + 6104.

2²⁹¹⁸⁶⁴ is an apocalyptic number.

291864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

291864 is an abundant number, since it is smaller than the sum of its proper divisors (437856).

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

291864 is a wasteful number, since it uses less digits than its factorization.

291864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12170 (or 12166 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 291864 is about 540.2443891425. The cubic root of 291864 is about 66.3325729622.

The spelling of 291864 in words is "two hundred ninety-one thousand, eight hundred sixty-four".