2169945 has 12 divisors (see below), whose sum is σ = 3761316. Its totient is φ = 1157280.

The previous prime is 2169941. The next prime is 2169967. The reversal of 2169945 is 5499612.

It can be written as a sum of positive squares in 2 ways, for example, as 363609 + 1806336 = 603^2 + 1344^2 .

It is not a de Polignac number, because 2169945 - 2² = 2169941 is a prime.

It is a super-2 number, since 2×2169945² = 9417322606050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2169941) 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, 24066 + ... + 24155.

It is an arithmetic number, because the mean of its divisors is an integer number (313443).

2^2169945 is an apocalyptic number.

It is an amenable number.

2169945 is a deficient number, since it is larger than the sum of its proper divisors (1591371).

2169945 is a wasteful number, since it uses less digits than its factorization.

2169945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48232 (or 48229 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 2169945 is about 1473.0733179309. The cubic root of 2169945 is about 129.4641652363.

The spelling of 2169945 in words is "two million, one hundred sixty-nine thousand, nine hundred forty-five".