12400811 has 4 divisors (see below), whose sum is σ = 12445224. Its totient is φ = 12356400.

The previous prime is 12400793. The next prime is 12400847. The reversal of 12400811 is 11800421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11800421 = 89 ⋅132589.

It is a cyclic number.

It is not a de Polignac number, because 12400811 - 2¹⁰ = 12399787 is a prime.

It is a super-2 number, since 2×12400811² = 307560226915442, which contains 22 as substring.

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 12400811.

It is not an unprimeable number, because it can be changed into a prime (12400511) 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, 21785 + ... + 22346.

It is an arithmetic number, because the mean of its divisors is an integer number (3111306).

Almost surely, 2^12400811 is an apocalyptic number.

12400811 is a deficient number, since it is larger than the sum of its proper divisors (44413).

12400811 is an equidigital number, since it uses as much as digits as its factorization.

12400811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44412.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 12400811 is about 3521.4785247109. The cubic root of 12400811 is about 231.4639513956.

The spelling of 12400811 in words is "twelve million, four hundred thousand, eight hundred eleven".