2215993 has 8 divisors (see below), whose sum is σ = 2398088. Its totient is φ = 2035584.

The previous prime is 2215991. The next prime is 2215999. The reversal of 2215993 is 3995122.

It can be written as a sum of positive squares in 4 ways, for example, as 374544 + 1841449 = 612^2 + 1357^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2215993 - 2¹ = 2215991 is a prime.

It is a d-powerful number, because it can be written as 2³ + 2²¹ + 1 + 5 + 9³ + 9⁵ + 3¹⁰ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4621 + ... + 5077.

It is an arithmetic number, because the mean of its divisors is an integer number (299761).

2^2215993 is an apocalyptic number.

It is an amenable number.

2215993 is a deficient number, since it is larger than the sum of its proper divisors (182095).

2215993 is a wasteful number, since it uses less digits than its factorization.

2215993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its digits is 4860, while the sum is 31.

The square root of 2215993 is about 1488.6211741071. The cubic root of 2215993 is about 130.3735410266.

The spelling of 2215993 in words is "two million, two hundred fifteen thousand, nine hundred ninety-three".