13405940 has 12 divisors (see below), whose sum is σ = 28152516. Its totient is φ = 5362368.

The previous prime is 13405927. The next prime is 13405957. The reversal of 13405940 is 4950431.

It can be written as a sum of positive squares in 2 ways, for example, as 6666724 + 6739216 = 2582^2 + 2596^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335129 + ... + 335168.

It is an arithmetic number, because the mean of its divisors is an integer number (2346043).

Almost surely, 2^13405940 is an apocalyptic number.

13405940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13405940 is an abundant number, since it is smaller than the sum of its proper divisors (14746576).

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

13405940 is a wasteful number, since it uses less digits than its factorization.

13405940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670306 (or 670304 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 13405940 is about 3661.4122958225. The cubic root of 13405940 is about 237.5558649747. Note that the first 3 decimals are identical.

The spelling of 13405940 in words is "thirteen million, four hundred five thousand, nine hundred forty".