12749821 has 16 divisors (see below), whose sum is σ = 15200640. Its totient is φ = 10463040.

The previous prime is 12749783. The next prime is 12749827. The reversal of 12749821 is 12894721.

It is a de Polignac number, because none of the positive numbers 2^k-12749821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749827) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36570 + ... + 36916.

It is an arithmetic number, because the mean of its divisors is an integer number (950040).

Almost surely, 2^12749821 is an apocalyptic number.

It is an amenable number.

12749821 is a deficient number, since it is larger than the sum of its proper divisors (2450819).

12749821 is a wasteful number, since it uses less digits than its factorization.

12749821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564.

The product of its digits is 8064, while the sum is 34.

The square root of 12749821 is about 3570.6891491699. The cubic root of 12749821 is about 233.6153431488.

The spelling of 12749821 in words is "twelve million, seven hundred forty-nine thousand, eight hundred twenty-one".