12749399 has 16 divisors (see below), whose sum is σ = 14676480. Its totient is φ = 10977120.

The previous prime is 12749393. The next prime is 12749413. The reversal of 12749399 is 99394721.

It is a cyclic number.

It is not a de Polignac number, because 12749399 - 2¹⁶ = 12683863 is a prime.

It is a super-2 number, since 2×12749399² = 325094349722402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12749393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17174 + ... + 17900.

It is an arithmetic number, because the mean of its divisors is an integer number (917280).

Almost surely, 2^12749399 is an apocalyptic number.

12749399 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12749399 is a deficient number, since it is larger than the sum of its proper divisors (1927081).

12749399 is a wasteful number, since it uses less digits than its factorization.

12749399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its digits is 122472, while the sum is 44.

The square root of 12749399 is about 3570.6300564466. The cubic root of 12749399 is about 233.6127656809.

The spelling of 12749399 in words is "twelve million, seven hundred forty-nine thousand, three hundred ninety-nine".