12739405 has 16 divisors (see below), whose sum is σ = 18391680. Its totient is φ = 8275392.

The previous prime is 12739403. The next prime is 12739429. The reversal of 12739405 is 50493721.

12739405 = 295² + 296² + ... + 399².

It is a cyclic number.

It is not a de Polignac number, because 12739405 - 2¹ = 12739403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12739403) 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, 8914 + ... + 10243.

It is an arithmetic number, because the mean of its divisors is an integer number (1149480).

Almost surely, 2^12739405 is an apocalyptic number.

It is an amenable number.

12739405 is a deficient number, since it is larger than the sum of its proper divisors (5652275).

12739405 is a wasteful number, since it uses less digits than its factorization.

12739405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19188.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 12739405 is about 3569.2303091843. The cubic root of 12739405 is about 233.5517082592.

The spelling of 12739405 in words is "twelve million, seven hundred thirty-nine thousand, four hundred five".