12320557 has 8 divisors (see below), whose sum is σ = 12585600. Its totient is φ = 12057504.

The previous prime is 12320549. The next prime is 12320579. The reversal of 12320557 is 75502321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12320557 - 2³ = 12320549 is a prime.

It is a super-2 number, since 2×12320557² = 303592249580498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320507) 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, 21369 + ... + 21937.

It is an arithmetic number, because the mean of its divisors is an integer number (1573200).

Almost surely, 2^12320557 is an apocalyptic number.

It is an amenable number.

12320557 is a deficient number, since it is larger than the sum of its proper divisors (265043).

12320557 is an equidigital number, since it uses as much as digits as its factorization.

12320557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 12320557 is about 3510.0650991114. The cubic root of 12320557 is about 230.9635506541.

Adding to 12320557 its reverse (75502321), we get a palindrome (87822878).

The spelling of 12320557 in words is "twelve million, three hundred twenty thousand, five hundred fifty-seven".