12657749 has 8 divisors (see below), whose sum is σ = 13796832. Its totient is φ = 11542320.

The previous prime is 12657739. The next prime is 12657763. The reversal of 12657749 is 94775621.

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 12657749 - 2¹⁶ = 12592213 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 (12657739) 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, 4787 + ... + 6944.

It is an arithmetic number, because the mean of its divisors is an integer number (1724604).

Almost surely, 2^12657749 is an apocalyptic number.

It is an amenable number.

12657749 is a deficient number, since it is larger than the sum of its proper divisors (1139083).

12657749 is a wasteful number, since it uses less digits than its factorization.

12657749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11827.

The product of its digits is 105840, while the sum is 41.

The square root of 12657749 is about 3557.7730394167. The cubic root of 12657749 is about 233.0516380604.

It can be divided in two parts, 126 and 57749, that added together give a palindrome (57875).

The spelling of 12657749 in words is "twelve million, six hundred fifty-seven thousand, seven hundred forty-nine".