13405765 has 8 divisors (see below), whose sum is σ = 16176888. Its totient is φ = 10664640.

The previous prime is 13405753. The next prime is 13405771. The reversal of 13405765 is 56750431.

It can be written as a sum of positive squares in 4 ways, for example, as 199809 + 13205956 = 447^2 + 3634^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13405765 - 2⁹ = 13405253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6502 + ... + 8311.

It is an arithmetic number, because the mean of its divisors is an integer number (2022111).

Almost surely, 2^13405765 is an apocalyptic number.

It is an amenable number.

13405765 is a deficient number, since it is larger than the sum of its proper divisors (2771123).

13405765 is a wasteful number, since it uses less digits than its factorization.

13405765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14999.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 13405765 is about 3661.3883978622. The cubic root of 13405765 is about 237.5548312922.

The spelling of 13405765 in words is "thirteen million, four hundred five thousand, seven hundred sixty-five".