12400451 has 4 divisors (see below), whose sum is σ = 14171952. Its totient is φ = 10628952.

The previous prime is 12400441. The next prime is 12400457. The reversal of 12400451 is 15400421.

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 12400451 - 2⁶ = 12400387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12400457) 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, 885740 + ... + 885753.

It is an arithmetic number, because the mean of its divisors is an integer number (3542988).

Almost surely, 2^12400451 is an apocalyptic number.

12400451 is a deficient number, since it is larger than the sum of its proper divisors (1771501).

12400451 is an equidigital number, since it uses as much as digits as its factorization.

12400451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771500.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 12400451 is about 3521.4274094463. The cubic root of 12400451 is about 231.4617115467.

Adding to 12400451 its reverse (15400421), we get a palindrome (27800872).

The spelling of 12400451 in words is "twelve million, four hundred thousand, four hundred fifty-one".