12765405 has 16 divisors (see below), whose sum is σ = 20588544. Its totient is φ = 6753600.

The previous prime is 12765383. The next prime is 12765413. The reversal of 12765405 is 50456721.

12765405 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12765405 - 2¹⁴ = 12749021 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1446 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (1286784).

Almost surely, 2^12765405 is an apocalyptic number.

12765405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12765405 is a deficient number, since it is larger than the sum of its proper divisors (7823139).

12765405 is a wasteful number, since it uses less digits than its factorization.

12765405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6836.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 12765405 is about 3572.8706945536. The cubic root of 12765405 is about 233.7104864243.

The spelling of 12765405 in words is "twelve million, seven hundred sixty-five thousand, four hundred five".