12540169 has 4 divisors (see below), whose sum is σ = 13277844. Its totient is φ = 11802496.

The previous prime is 12540167. The next prime is 12540173. The reversal of 12540169 is 96104521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96104521 = 29 ⋅3313949.

It can be written as a sum of positive squares in 2 ways, for example, as 10810944 + 1729225 = 3288^2 + 1315^2 .

It is a cyclic number.

It is not a de Polignac number, because 12540169 - 2¹ = 12540167 is a prime.

It is a super-2 number, since 2×12540169² = 314511677097122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12540167) 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, 368812 + ... + 368845.

It is an arithmetic number, because the mean of its divisors is an integer number (3319461).

Almost surely, 2^12540169 is an apocalyptic number.

It is an amenable number.

12540169 is a deficient number, since it is larger than the sum of its proper divisors (737675).

12540169 is an equidigital number, since it uses as much as digits as its factorization.

12540169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737674.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 12540169 is about 3541.2101039052. The cubic root of 12540169 is about 232.3277731734.

The spelling of 12540169 in words is "twelve million, five hundred forty thousand, one hundred sixty-nine".