12500018 has 4 divisors (see below), whose sum is σ = 18750030. Its totient is φ = 6250008.

The previous prime is 12500003. The next prime is 12500029. The reversal of 12500018 is 81000521.

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

It can be written as a sum of positive squares in only one way, i.e., 6265009 + 6235009 = 2503^2 + 2497^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12499969 and 12500005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3125003 + ... + 3125006.

Almost surely, 2^12500018 is an apocalyptic number.

12500018 is a deficient number, since it is larger than the sum of its proper divisors (6250012).

12500018 is an equidigital number, since it uses as much as digits as its factorization.

12500018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6250011.

The product of its (nonzero) digits is 80, while the sum is 17.

The square root of 12500018 is about 3535.5364515162. The cubic root of 12500018 is about 232.0795530787.

Adding to 12500018 its reverse (81000521), we get a palindrome (93500539).

It can be divided in two parts, 125000 and 18, that multiplied together give a square (2250000 = 1500²).

The spelling of 12500018 in words is "twelve million, five hundred thousand, eighteen".