12400215634 has 4 divisors (see below), whose sum is σ = 18600323454. Its totient is φ = 6200107816.

The previous prime is 12400215623. The next prime is 12400215643. The reversal of 12400215634 is 43651200421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43651200421 = 5519 ⋅7909259.

It can be written as a sum of positive squares in only one way, i.e., 8354874025 + 4045341609 = 91405^2 + 63603^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3100053907 + ... + 3100053910.

Almost surely, 2^12400215634 is an apocalyptic number.

12400215634 is a deficient number, since it is larger than the sum of its proper divisors (6200107820).

12400215634 is an equidigital number, since it uses as much as digits as its factorization.

12400215634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6200107819.

The product of its (nonzero) digits is 5760, while the sum is 28.

The spelling of 12400215634 in words is "twelve billion, four hundred million, two hundred fifteen thousand, six hundred thirty-four".