2159969 has 12 divisors (see below), whose sum is σ = 2661444. Its totient is φ = 1741824.

The previous prime is 2159959. The next prime is 2160001. The reversal of 2159969 is 9699512.

It can be written as a sum of positive squares in 2 ways, for example, as 1500625 + 659344 = 1225^2 + 812^2 .

It is not a de Polignac number, because 2159969 - 2⁸ = 2159713 is a prime.

It is a super-2 number, since 2×2159969² = 9330932161922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 464 + ... + 2129.

It is an arithmetic number, because the mean of its divisors is an integer number (221787).

2^2159969 is an apocalyptic number.

It is an amenable number.

2159969 is a deficient number, since it is larger than the sum of its proper divisors (501475).

2159969 is a wasteful number, since it uses less digits than its factorization.

2159969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624 (or 2617 counting only the distinct ones).

The product of its digits is 43740, while the sum is 41.

The square root of 2159969 is about 1469.6832992179. The cubic root of 2159969 is about 129.2654629964.

The spelling of 2159969 in words is "two million, one hundred fifty-nine thousand, nine hundred sixty-nine".