12401645 has 4 divisors (see below), whose sum is σ = 14881980. Its totient is φ = 9921312.

The previous prime is 12401593. The next prime is 12401671. The reversal of 12401645 is 54610421.

12401645 is digitally balanced in base 3, 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 an emirpimes, since its reverse is a distinct semiprime: 54610421 = 691 ⋅79031.

It can be written as a sum of positive squares in 2 ways, for example, as 5750404 + 6651241 = 2398^2 + 2579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12401645 is a prime.

It is a super-3 number, since 3×12401645³ (a number of 22 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12401645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1240160 + ... + 1240169.

It is an arithmetic number, because the mean of its divisors is an integer number (3720495).

Almost surely, 2^12401645 is an apocalyptic number.

It is an amenable number.

12401645 is a deficient number, since it is larger than the sum of its proper divisors (2480335).

12401645 is an equidigital number, since it uses as much as digits as its factorization.

12401645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2480334.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 12401645 is about 3521.5969388901. The cubic root of 12401645 is about 231.4691402124.

The spelling of 12401645 in words is "twelve million, four hundred one thousand, six hundred forty-five".