13766740 has 36 divisors (see below), whose sum is σ = 31312764. Its totient is φ = 5081856.

The previous prime is 13766737. The next prime is 13766741. The reversal of 13766740 is 4766731.

13766740 = 951² + 952² + ... + 965².

It can be written as a sum of positive squares in 6 ways, for example, as 5541316 + 8225424 = 2354^2 + 2868^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13766696 and 13766705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13766741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1344 + ... + 5416.

It is an arithmetic number, because the mean of its divisors is an integer number (869799).

Almost surely, 2^13766740 is an apocalyptic number.

13766740 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 13766740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15656382).

13766740 is an abundant number, since it is smaller than the sum of its proper divisors (17546024).

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

13766740 is a wasteful number, since it uses less digits than its factorization.

13766740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108 (or 4093 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 13766740 is about 3710.3557780892. The cubic root of 13766740 is about 239.6681756900.

Subtracting from 13766740 its reverse (4766731), we obtain a palindrome (9000009).

The spelling of 13766740 in words is "thirteen million, seven hundred sixty-six thousand, seven hundred forty".