12400961 has 4 divisors (see below), whose sum is σ = 12801024. Its totient is φ = 12000900.

The previous prime is 12400943. The next prime is 12400967. The reversal of 12400961 is 16900421.

It is a happy number.

12400961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12400961 - 2⁶ = 12400897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12400967) 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, 199985 + ... + 200046.

It is an arithmetic number, because the mean of its divisors is an integer number (3200256).

Almost surely, 2^12400961 is an apocalyptic number.

It is an amenable number.

12400961 is a deficient number, since it is larger than the sum of its proper divisors (400063).

12400961 is an equidigital number, since it uses as much as digits as its factorization.

12400961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400062.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 12400961 is about 3521.4998225188. The cubic root of 12400961 is about 231.4648846532.

The spelling of 12400961 in words is "twelve million, four hundred thousand, nine hundred sixty-one".