13780746 has 32 divisors (see below), whose sum is σ = 34999680. Its totient is φ = 3937248.

The previous prime is 13780733. The next prime is 13780747. The reversal of 13780746 is 64708731.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13780746.

It is not an unprimeable number, because it can be changed into a prime (13780747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17851 + ... + 18606.

It is an arithmetic number, because the mean of its divisors is an integer number (1093740).

Almost surely, 2^13780746 is an apocalyptic number.

13780746 is an abundant number, since it is smaller than the sum of its proper divisors (21218934).

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

13780746 is a wasteful number, since it uses less digits than its factorization.

13780746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36475 (or 36469 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 13780746 is about 3712.2427183577. The cubic root of 13780746 is about 239.7494259771.

The spelling of 13780746 in words is "thirteen million, seven hundred eighty thousand, seven hundred forty-six".