13405340 has 48 divisors (see below), whose sum is σ = 30989952. Its totient is φ = 4839936.

The previous prime is 13405309. The next prime is 13405349. The reversal of 13405340 is 4350431.

13405340 = T₂₆₉ + T₂₇₀ + ... + T₄₆₃.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13405349) 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, 11672 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (645624).

Almost surely, 2^13405340 is an apocalyptic number.

13405340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13405340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15494976).

13405340 is an abundant number, since it is smaller than the sum of its proper divisors (17584612).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13405340 is a wasteful number, since it uses less digits than its factorization.

13405340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1164 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 13405340 is about 3661.3303593093. The cubic root of 13405340 is about 237.5523208829.

Adding to 13405340 its reverse (4350431), we get a palindrome (17755771).

The spelling of 13405340 in words is "thirteen million, four hundred five thousand, three hundred forty".