2173969 has 4 divisors (see below), whose sum is σ = 2484544. Its totient is φ = 1863396.

The previous prime is 2173967. The next prime is 2173981. The reversal of 2173969 is 9693712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2173969 - 2¹ = 2173967 is a prime.

It is a super-2 number, since 2×2173969² = 9452282425922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2173967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155277 + ... + 155290.

It is an arithmetic number, because the mean of its divisors is an integer number (621136).

2^2173969 is an apocalyptic number.

It is an amenable number.

2173969 is a deficient number, since it is larger than the sum of its proper divisors (310575).

2173969 is an equidigital number, since it uses as much as digits as its factorization.

2173969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310574.

The product of its digits is 20412, while the sum is 37.

The square root of 2173969 is about 1474.4385372066. The cubic root of 2173969 is about 129.5441430088.

It can be divided in two parts, 217 and 3969, that added together give a triangular number (4186 = T₉₁).

The spelling of 2173969 in words is "two million, one hundred seventy-three thousand, nine hundred sixty-nine".