12420156 has 24 divisors (see below), whose sum is σ = 33120640. Its totient is φ = 3548592.

The previous prime is 12420151. The next prime is 12420211. The reversal of 12420156 is 65102421.

12420156 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12420151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73846 + ... + 74013.

Almost surely, 2^12420156 is an apocalyptic number.

It is an amenable number.

12420156 is an abundant number, since it is smaller than the sum of its proper divisors (20700484).

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

12420156 is a wasteful number, since it uses less digits than its factorization.

12420156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147873 (or 147871 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 12420156 is about 3524.2241699415. The cubic root of 12420156 is about 231.5842484686.

Adding to 12420156 its reverse (65102421), we get a palindrome (77522577).

The spelling of 12420156 in words is "twelve million, four hundred twenty thousand, one hundred fifty-six".