291998 has 8 divisors (see below), whose sum is σ = 500592. Its totient is φ = 125136.

The previous prime is 291997. The next prime is 292021. The reversal of 291998 is 899192.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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 291998.

It is not an unprimeable number, because it can be changed into a prime (291997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10415 + ... + 10442.

It is an arithmetic number, because the mean of its divisors is an integer number (62574).

2²⁹¹⁹⁹⁸ is an apocalyptic number.

291998 is a deficient number, since it is larger than the sum of its proper divisors (208594).

291998 is a wasteful number, since it uses less digits than its factorization.

291998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20866.

The product of its digits is 11664, while the sum is 38.

The square root of 291998 is about 540.3683928581. The cubic root of 291998 is about 66.3427229006.

The spelling of 291998 in words is "two hundred ninety-one thousand, nine hundred ninety-eight".