12420523 has 4 divisors (see below), whose sum is σ = 13151160. Its totient is φ = 11689888.

The previous prime is 12420521. The next prime is 12420571. The reversal of 12420523 is 32502421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32502421 = 7 ⋅4643203.

It is a cyclic number.

It is not a de Polignac number, because 12420523 - 2¹ = 12420521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12420523.

It is not an unprimeable number, because it can be changed into a prime (12420521) 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, 365293 + ... + 365326.

It is an arithmetic number, because the mean of its divisors is an integer number (3287790).

Almost surely, 2^12420523 is an apocalyptic number.

12420523 is a deficient number, since it is larger than the sum of its proper divisors (730637).

12420523 is an equidigital number, since it uses as much as digits as its factorization.

12420523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730636.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 12420523 is about 3524.2762377544. The cubic root of 12420523 is about 231.5865294540.

Adding to 12420523 its reverse (32502421), we get a palindrome (44922944).

The spelling of 12420523 in words is "twelve million, four hundred twenty thousand, five hundred twenty-three".