12457621 has 4 divisors (see below), whose sum is σ = 13590144. Its totient is φ = 11325100.

The previous prime is 12457619. The next prime is 12457633. The reversal of 12457621 is 12675421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12457621 - 2¹ = 12457619 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 12457621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12457661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 566245 + ... + 566266.

It is an arithmetic number, because the mean of its divisors is an integer number (3397536).

Almost surely, 2^12457621 is an apocalyptic number.

12457621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12457621 is a deficient number, since it is larger than the sum of its proper divisors (1132523).

12457621 is a wasteful number, since it uses less digits than its factorization.

12457621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132522.

The product of its digits is 3360, while the sum is 28.

The square root of 12457621 is about 3529.5355218499. The cubic root of 12457621 is about 231.8168701987.

The spelling of 12457621 in words is "twelve million, four hundred fifty-seven thousand, six hundred twenty-one".