12577391 has 4 divisors (see below), whose sum is σ = 12718800. Its totient is φ = 12435984.

The previous prime is 12577379. The next prime is 12577393. The reversal of 12577391 is 19377521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19377521 = 347 ⋅55843.

It is a cyclic number.

It is not a de Polignac number, because 12577391 - 2¹⁴ = 12561007 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 (12577393) 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, 70571 + ... + 70748.

It is an arithmetic number, because the mean of its divisors is an integer number (3179700).

Almost surely, 2^12577391 is an apocalyptic number.

12577391 is a deficient number, since it is larger than the sum of its proper divisors (141409).

12577391 is an equidigital number, since it uses as much as digits as its factorization.

12577391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141408.

The product of its digits is 13230, while the sum is 35.

The square root of 12577391 is about 3546.4617578652. The cubic root of 12577391 is about 232.5574128843.

The spelling of 12577391 in words is "twelve million, five hundred seventy-seven thousand, three hundred ninety-one".