12420534 has 16 divisors (see below), whose sum is σ = 28389888. Its totient is φ = 3548712.

The previous prime is 12420521. The next prime is 12420571. The reversal of 12420534 is 43502421.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 12420534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147822 + ... + 147905.

It is an arithmetic number, because the mean of its divisors is an integer number (1774368).

Almost surely, 2^12420534 is an apocalyptic number.

12420534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12420534 is an abundant number, since it is smaller than the sum of its proper divisors (15969354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12420534 is a wasteful number, since it uses less digits than its factorization.

12420534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295739.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 12420534 is about 3524.2777983581. The cubic root of 12420534 is about 231.5865978207.

Adding to 12420534 its reverse (43502421), we get a palindrome (55922955).

The spelling of 12420534 in words is "twelve million, four hundred twenty thousand, five hundred thirty-four".