12457421 has 6 divisors (see below), whose sum is σ = 13023150. Its totient is φ = 11915288.

The previous prime is 12457411. The next prime is 12457427. The reversal of 12457421 is 12475421.

It can be written as a sum of positive squares in only one way, i.e., 6400900 + 6056521 = 2530^2 + 2461^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12457421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11246 + ... + 12303.

It is an arithmetic number, because the mean of its divisors is an integer number (2170525).

Almost surely, 2^12457421 is an apocalyptic number.

It is an amenable number.

12457421 is a deficient number, since it is larger than the sum of its proper divisors (565729).

12457421 is an equidigital number, since it uses as much as digits as its factorization.

12457421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23595 (or 23572 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 12457421 is about 3529.5071893963. The cubic root of 12457421 is about 231.8156296295.

The spelling of 12457421 in words is "twelve million, four hundred fifty-seven thousand, four hundred twenty-one".