12402505 has 4 divisors (see below), whose sum is σ = 14883012. Its totient is φ = 9922000.

The previous prime is 12402499. The next prime is 12402527. The reversal of 12402505 is 50520421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9566649 + 2835856 = 3093^2 + 1684^2 .

It is not a de Polignac number, because 12402505 - 2¹¹ = 12400457 is a prime.

It is a super-3 number, since 3×12402505³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240246 + ... + 1240255.

It is an arithmetic number, because the mean of its divisors is an integer number (3720753).

Almost surely, 2^12402505 is an apocalyptic number.

It is an amenable number.

12402505 is a deficient number, since it is larger than the sum of its proper divisors (2480507).

12402505 is an equidigital number, since it uses as much as digits as its factorization.

12402505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480506.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 12402505 is about 3521.7190404687. The cubic root of 12402505 is about 231.4744905472.

Adding to 12402505 its reverse (50520421), we get a palindrome (62922926).

The spelling of 12402505 in words is "twelve million, four hundred two thousand, five hundred five".