12400511 has 2 divisors, whose sum is σ = 12400512. Its totient is φ = 12400510.

The previous prime is 12400489. The next prime is 12400517. The reversal of 12400511 is 11500421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12400511 - 2¹⁰ = 12399487 is a prime.

It is a super-2 number, since 2×12400511² = 307545346122242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200255 + 6200256.

It is an arithmetic number, because the mean of its divisors is an integer number (6200256).

Almost surely, 2^12400511 is an apocalyptic number.

12400511 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400511 is an equidigital number, since it uses as much as digits as its factorization.

12400511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 12400511 is about 3521.4359287086. The cubic root of 12400511 is about 231.4620848579.

Adding to 12400511 its reverse (11500421), we get a palindrome (23900932).

The spelling of 12400511 in words is "twelve million, four hundred thousand, five hundred eleven".