12420057 has 16 divisors (see below), whose sum is σ = 18411008. Its totient is φ = 7395840.

The previous prime is 12420043. The next prime is 12420059. The reversal of 12420057 is 75002421.

It is not a de Polignac number, because 12420057 - 2⁴ = 12420041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3928 + ... + 6345.

It is an arithmetic number, because the mean of its divisors is an integer number (1150688).

Almost surely, 2^12420057 is an apocalyptic number.

It is an amenable number.

12420057 is a deficient number, since it is larger than the sum of its proper divisors (5990951).

12420057 is a wasteful number, since it uses less digits than its factorization.

12420057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10320.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 12420057 is about 3524.2101242690. The cubic root of 12420057 is about 231.5836331542.

Adding to 12420057 its reverse (75002421), we get a palindrome (87422478).

The spelling of 12420057 in words is "twelve million, four hundred twenty thousand, fifty-seven".