2159967 has 4 divisors (see below), whose sum is σ = 2879960. Its totient is φ = 1439976.

The previous prime is 2159959. The next prime is 2160001. The reversal of 2159967 is 7699512.

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

It is not a de Polignac number, because 2159967 - 2³ = 2159959 is a prime.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 5⁵ + 9² + 9⁵ + 6³ + 7³ .

It is a D-number.

It is a Duffinian number.

2159967 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359992 + ... + 359997.

It is an arithmetic number, because the mean of its divisors is an integer number (719990).

2^2159967 is an apocalyptic number.

2159967 is a deficient number, since it is larger than the sum of its proper divisors (719993).

2159967 is an equidigital number, since it uses as much as digits as its factorization.

2159967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719992.

The product of its digits is 34020, while the sum is 39.

The square root of 2159967 is about 1469.6826187990. The cubic root of 2159967 is about 129.2654230991.

The spelling of 2159967 in words is "two million, one hundred fifty-nine thousand, nine hundred sixty-seven".