13409040 has 40 divisors (see below), whose sum is σ = 41568768. Its totient is φ = 3575680.

The previous prime is 13409027. The next prime is 13409047. The reversal of 13409040 is 4090431.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 13408998 and 13409016.

It is not an unprimeable number, because it can be changed into a prime (13409047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27696 + ... + 28175.

Almost surely, 2^13409040 is an apocalyptic number.

13409040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13409040 is an abundant number, since it is smaller than the sum of its proper divisors (28159728).

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

13409040 is a wasteful number, since it uses less digits than its factorization.

13409040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55887 (or 55881 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 13409040 is about 3661.8356052668. The cubic root of 13409040 is about 237.5741744312.

Adding to 13409040 its reverse (4090431), we get a palindrome (17499471).

The spelling of 13409040 in words is "thirteen million, four hundred nine thousand, forty".