2118399 has 4 divisors (see below), whose sum is σ = 2824536. Its totient is φ = 1412264.

The previous prime is 2118397. The next prime is 2118419. The reversal of 2118399 is 9938112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2118399 - 2¹ = 2118397 is a prime.

It is a super-2 number, since 2×2118399² = 8975228646402, which contains 22 as substring.

It is a D-number.

2118399 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2118397) 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, 353064 + ... + 353069.

It is an arithmetic number, because the mean of its divisors is an integer number (706134).

2^2118399 is an apocalyptic number.

2118399 is a deficient number, since it is larger than the sum of its proper divisors (706137).

2118399 is an equidigital number, since it uses as much as digits as its factorization.

2118399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706136.

The product of its digits is 3888, while the sum is 33.

The square root of 2118399 is about 1455.4720883617. The cubic root of 2118399 is about 128.4308196512.

The spelling of 2118399 in words is "two million, one hundred eighteen thousand, three hundred ninety-nine".