12503905 has 4 divisors (see below), whose sum is σ = 15004692. Its totient is φ = 10003120.

The previous prime is 12503903. The next prime is 12503917. The reversal of 12503905 is 50930521.

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 5326864 + 7177041 = 2308^2 + 2679^2 .

It is not a de Polignac number, because 12503905 - 2¹ = 12503903 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12503905.

It is not an unprimeable number, because it can be changed into a prime (12503903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250386 + ... + 1250395.

It is an arithmetic number, because the mean of its divisors is an integer number (3751173).

Almost surely, 2^12503905 is an apocalyptic number.

It is an amenable number.

12503905 is a deficient number, since it is larger than the sum of its proper divisors (2500787).

12503905 is an equidigital number, since it uses as much as digits as its factorization.

12503905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500786.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 12503905 is about 3536.0861132048. The cubic root of 12503905 is about 232.1036063703.

It can be divided in two parts, 1250 and 3905, that multiplied together give a triangular number (4881250 = T₃₁₂₄).

The spelling of 12503905 in words is "twelve million, five hundred three thousand, nine hundred five".