2391998 has 8 divisors (see below), whose sum is σ = 4100592. Its totient is φ = 1025136.

The previous prime is 2391997. The next prime is 2392001. The reversal of 2391998 is 8991932.

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 not an unprimeable number, because it can be changed into a prime (2391997) 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, 85415 + ... + 85442.

It is an arithmetic number, because the mean of its divisors is an integer number (512574).

2^2391998 is an apocalyptic number.

2391998 is a deficient number, since it is larger than the sum of its proper divisors (1708594).

2391998 is a wasteful number, since it uses less digits than its factorization.

2391998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170866.

The product of its digits is 34992, while the sum is 41.

The square root of 2391998 is about 1546.6085477586. The cubic root of 2391998 is about 133.7376242662.

The spelling of 2391998 in words is "two million, three hundred ninety-one thousand, nine hundred ninety-eight".