13391040 has 224 divisors, whose sum is σ = 48646080. Its totient is φ = 3096576.

The previous prime is 13391023. The next prime is 13391041. The reversal of 13391040 is 4019331.

It is a junction number, because it is equal to n+sod(n) for n = 13390998 and 13391016.

It is not an unprimeable number, because it can be changed into a prime (13391041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361902 + ... + 361938.

It is an arithmetic number, because the mean of its divisors is an integer number (217170).

Almost surely, 2^13391040 is an apocalyptic number.

13391040 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 13391040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24323040).

13391040 is an abundant number, since it is smaller than the sum of its proper divisors (35255040).

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

13391040 is a wasteful number, since it uses less digits than its factorization.

13391040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 13391040 is about 3659.3769961566. The cubic root of 13391040 is about 237.4678220487.

The spelling of 13391040 in words is "thirteen million, three hundred ninety-one thousand, forty".