12690557 has 4 divisors (see below), whose sum is σ = 13844256. Its totient is φ = 11536860.

The previous prime is 12690553. The next prime is 12690571. The reversal of 12690557 is 75509621.

12690557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12690557 - 2² = 12690553 is a prime.

It is a super-2 number, since 2×12690557² = 322100473940498, 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 (12690553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576833 + ... + 576854.

It is an arithmetic number, because the mean of its divisors is an integer number (3461064).

Almost surely, 2^12690557 is an apocalyptic number.

It is an amenable number.

12690557 is a deficient number, since it is larger than the sum of its proper divisors (1153699).

12690557 is a wasteful number, since it uses less digits than its factorization.

12690557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153698.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 12690557 is about 3562.3808050235. The cubic root of 12690557 is about 233.2528155291.

The spelling of 12690557 in words is "twelve million, six hundred ninety thousand, five hundred fifty-seven".