12400051 has 4 divisors (see below), whose sum is σ = 12489400. Its totient is φ = 12310704.

The previous prime is 12400049. The next prime is 12400097. The reversal of 12400051 is 15000421.

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

It is a cyclic number.

It is not a de Polignac number, because 12400051 - 2¹ = 12400049 is a prime.

It is a super-2 number, since 2×12400051² = 307522529605202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12400001) 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, 44466 + ... + 44743.

It is an arithmetic number, because the mean of its divisors is an integer number (3122350).

Almost surely, 2^12400051 is an apocalyptic number.

12400051 is a deficient number, since it is larger than the sum of its proper divisors (89349).

12400051 is an equidigital number, since it uses as much as digits as its factorization.

12400051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89348.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 12400051 is about 3521.3706138377. The cubic root of 12400051 is about 231.4592227748.

Adding to 12400051 its reverse (15000421), we get a palindrome (27400472).

The spelling of 12400051 in words is "twelve million, four hundred thousand, fifty-one".